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Protesters clash with police in Philadelphia on Thursday, April 30, 2015. The event in Philadelphia follows days of unrest in Baltimore amid Freddie Gray's police-custody death. (AP Photo/Matt Rourke)

Matt Rourke/AP

Protesters clash with police in Philadelphia on Thursday. The event in Philadelphia follows days of unrest in Baltimore amid Freddie Gray’s police-custody death.

Protesters demonstrate ahead of a 10 p.m. curfew Wednesday, April 29, 2015, in Baltimore. The curfew was imposed after unrest in Baltimore over the death of Freddie Gray while in police custody. (AP Photo/Matt Rourke)

Matt Rourke/AP

Protesters demonstrate ahead of a 10pm curfew in Baltimore, Maryland. The curfew was imposed after unrest in Baltimore over the death of Freddie Gray while in police custody 

***BESTPIX*** National Guard Activated To Calm Tensions In Baltimore In Wake Of Riots After Death Of Freddie Gray...BALTIMORE, MD - APRIL 28:  A protester walks through tear gas as police enforce a mandatory, city-wide curfew of 10PM near the CVS pharmacy that was set on fire yesterday during rioting after the funeral of Freddie Gray, on April 28, 2015 in Baltimore, Maryland. Gray, 25, was arrested for possessing a switch blade knife April 12 outside the Gilmor Houses housing project on Baltimore's west side. According to his attorney, Gray died a week later in the hospital from a severe spinal cord injury he received while in police custody.  (Photo by Andrew Burton/Getty Images) ***BESTPIX***

Andrew Burton/Getty

A protester walks through tear gas as police enforced a mandatory, city-wide curfew of 10pm near the CVS pharmacy that was set on fire on Monday during rioting after the funeral of Freddie Gray in Baltimore, Maryland

Demonstrators Gather Outside Baltimore Police Station to Protest Death of Freddie Gray...epa04723487 A young girl peers into a destroyed Baltimore City Police car along North Avenue near a CVS that was on fire during a protest for the death of Freddie Gray in Baltimore, Maryland, USA, 27 April 2015. Gray died of spinal cord injuries on 19 April while in police custody; the US Justice Department announced that they are launching their own investigation into the case.  EPA/NOAH SCIALOM

Noah Scialom/EPA

A young girl peers into a destroyed Baltimore City Police car along North Avenue near a CVS that was on fire during a protest for the death of Freddie Gray in Baltimore, Maryland

Protesters Hold Vigil And March Over Death Of Freddie Gray After Police Arrest...BALTIMORE, MD - ARPIL 21:  Protestors walk toward Baltimore Police Department's Western District police station during a march and vigil over the death of Freddie Gray, April 21, 2015 in Baltimore, Maryland.  Gray, 25, died from spinal injuries on April 19, one week after being taken into police custody. (Photo by Drew Angerer/Getty Images)

Drew Angerer/Getty

Protestors walk towards Baltimore Police Department’s Western District police station during a march and vigil over the death of Freddie Gray in Baltimore, Maryland 

TOPSHOTS Lightning brightens the night s...TOPSHOTS Lightning brightens the night sky over Washington, DC, during a rainstorm on April 20, 2015.  AFP PHOTO / MLADEN ANTONOVMLADEN ANTONOV/AFP/Getty Images

Mladen Antonov/AFP/Getty

Lightning brightens the night sky over Washington D.C. during a rainstorm

rthur Prioleau...Rev. Dr. Arthur Prioleau holds a sign during a protest in the shooting death of Walter Scott at city hall in North Charleston, S.C., Wednesday, April 8, 2015.  Scott was killed by a North Charleston police office after a traffic stop on Saturday. The officer, Michael Thomas Slager,  has been charged with murder. (AP Photo/Chuck Burton)

Chuck Burton/AP

Rev. Dr. Arthur Prioleau holds a sign during a protest in the shooting death of Walter Scott at city hall in North Charleston, South Carolina. Scott was killed by a North Charleston police office after a traffic stop on Saturday. The officer, Michael Thomas Slager, has been charged with murder 

U.S. President Barack Obama delivers remarks during an Easter Prayer Breakfast in the East Room of the White House  April 7, 2015 in Washington, DC. According to the White House, Obama hosted the event to bring Christian religious leaders together at the White House to 'pray and reflect on Holy Week and Easter.

Chip Somodevilla/Getty

U.S. President Barack Obama delivers remarks during an Easter prayer breakfast in the East Room of the White House. According to the White House, Obama hosted the event to bring Christian religious leaders together at the White House to ‘pray and reflect on Holy Week and Easter 

An ice covered statue is seen in Lafayette Square March 2, 2015 in Washington, DC.

Brendan Smialowski/AFP

An ice covered statue is seen in Lafayette Square on Monday in Washington, DC

Alan Gross is greeted with hugs after arriving at Joint Base Andrews, Maryland in this White House handout photo...Alan Gross is greeted with hugs after arriving at Joint Base Andrews, Maryland in this December 17, 2014 White House handout photo. The United States and Cuba agreed on Wednesday to restore diplomatic ties that Washington severed more than 50 years ago, and President Barack Obama called for an end to the long economic embargo against its old Cold War enemy.  Gross spent 5 years as a prisoner in Cuba. REUTERS/Lawrence Jackson/White House/Handout via Reuters  (UNITED STATES - Tags: POLITICS) THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS

Lawrence Jackson/White House/Reuters

Alan Gross, an American imprisoned in Cuba for five years, arrives at Joint Base Andrews, Maryland. The US and Cuba agreed on Wednesday to restore diplomatic ties that Washington severed more than 50 years ago, and President Barack Obama called for an end to the long economic embargo against its old enemy. 

Dr. Joe Wallace, right, uses a pressure washer to cut years of algae growth off the Eye Spy statues at Silver Springs State Park in Ocala, Florida.

Alan Youngblood/The Ocala Star-Banner/AP

Dr. Joe Wallace, right, uses a pressure washer to cut years of algae growth off the Eye Spy statues at Silver Springs State Park in Ocala, Florida.

Virginia residents wait in line in the pre-dawn hours to vote in the 2014 US midterm elections at a historic property called the Hunter House at Nottoway Park in Vienna, Virginia, USA, 04 November 2014. Virginia voters are choosing between Democrat Mark Warner and Republican Ed Gillespie for the US Senate. US voters are increasingly disillusioned with Washington as they head to the polls 04 November to elect senators and members of the House of Representatives.

Jim Lo Scalo/EPA

Residents wait in line in the pre-dawn hours to vote in the 2014 US midterm elections at a historic property called the Hunter House at Nottoway Park in Vienna, Virginia

 Iowa Senate Candidate Bruce Braley Campaigns Ahead Of Midterm Elections

Chip Somodevilla/Getty Images

Democratic US Senate candidate Bruce Braley (L) hugs volunteer Pat Halferty during a campaign stop at the Lynn Count Democratic HQ on November 3 in Cedar Rapids, Iowa. Polls put Braley neck-and-neck with Republican Joni Ernst and the Iowa result could decide which party controls the Senate

Protests over Michael Brown shooting...epaselect epa04363300 National Guard watch from a small hill top a couple blocks away as demonstrators protest the shooting death of Michael Brown in Ferguson, Missouri, USA, 21 August 2014. The National Guard is to withdraw from Ferguson, Missouri as nearly two weeks of often violent protests have finally waned. Only six arrests were logged overnight in the town, which saw a more peaceful night after steady protests related to the killing of an unarmed black teenager by a policeman.  EPA/LARRY W. SMITH

Larry W. Smith/EPA

Members of the National Guard watch from a small hilltop two blocks away from protesters in Ferguson, Missouri 

Protests over Michael Brown shooting...epa04363296 Demonstrators protest the shooting death of Michael Brown in Ferguson, Missouri, USA, 21 August 2014. The National Guard is to withdraw from Ferguson, Missouri as nearly two weeks of often violent protests have finally waned. Only six arrests were logged overnight in the town, which saw a more peaceful night after steady protests related to the killing of an unarmed black teenager by a policeman.  EPA/LARRY W. SMITH

Larry W.Smith/EPA

Demonstrators protest the shooting of Michael Brown in Ferguson, Missouri, as the National Guard announces its withdrawal from the town as calm descends following two weeks of often violent clashes 

Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri...Police officers point their weapons at demonstrators protesting against the shooting death of Michael Brown in Ferguson, Missouri August 18, 2014. Police fired tear gas and stun grenades at protesters on Monday after days of unrest sparked by the fatal shooting of unarmed black teenager Michael Brown by a white policeman. REUTERS/Joshua Lott (UNITED STATES - Tags: CRIME LAW CIVIL UNREST)

Joshua Lott/Reuters

Police fired tear gas and stun grenades at protesters on Monday in Ferguson, Missouri, after days of unrest sparked by the fatal shooting of unarmed black teenager Michael Brown by a white policeman 

Outrage In Missouri Town After Police Shooting Of 18-Yr-Old Man...FERGUSON, MO - AUGUST 17:  Tear gas reigns down on a woman standing with her arms raised in the street after a demonstration over the killing of teenager Michael Brown by a Ferguson police on August 17, 2014 in Ferguson, Missouri. Despite the Brown family's continued call for peaceful demonstrations, violent protests have erupted nearly every night in Ferguson since his August 9, death.  (Photo by Scott Olson/Getty Images)

Scott Olson/Getty

Tear gas rains down on a woman standing with her arms raised after a demonstration over the killing of teenager Michael Brown by a Ferguson policeman in Missouri

REUTERS PICTURE HIGHLIGHT...ATTENTION EDITORS - REUTERS PICTURE HIGHLIGHT TRANSMITTED BY 0131 GMT ON JULY 3, 2014    LJJ015  Lightning strikes One World Trade Center in Manhattan as the sun sets behind the city after a summer storm in New York.  REUTERS/Lucas Jackson     REUTERS NEWS PICTURES HAS NOW MADE IT EASIER TO FIND THE BEST PHOTOS FROM THE MOST IMPORTANT STORIES AND TOP STANDALONES EACH DAY. Search for "TPX" in the IPTC Supplemental Category field or "IMAGES OF THE DAY" in the Caption field and you will find a selection of 80-100 of our daily Top Pictures.    REUTERS NEWS PICTURES.     TEMPLATE OUT

Lucas Jackson/Reuters

Lightning strikes One World Trade Center in Manhattan as the sun sets behind the city after a summer storm in New York on Wednesday 

A FIFA official tests the pitch as rain pours down prior to the group G World Cup soccer match between the USA and Germany at the Arena Pernambuco in Recife, Brazil, Thursday, June 26, 2014. (AP Photo/Petr David Josek)

Petr David Josek/AP

A Fifa official tests the pitch as rain pours down before the group G World Cup football match between the US and Germany at the Arena Pernambuco in Recife, Brazil 

A longtime exposure shows smolderings remains of overnight fires on the hillsides of San Marcos, San Diego county, California, USA, early 16 May 2014. Over 1,000 firefighters battled a series of fast-moving southern California wildfires on 15 May that spread across the region despite the efforts of more than 20 firefighting aircraft. Huge clouds of black smoke hung over much of San Diego County, where the worst blazes were burning 15 May, driven by the blistering Santa Ana winds, which bring strong, dry gusts out from the interior desert.

Stuart Palley/EPA

Smoldering remains of overnight fires on the hillsides of San Marcos, San Diego county, California, USA, early Friday. Over 1,000 firefighters battled a series of fast-moving southern California wildfires that spread across the region despite the efforts of more than 20 firefighting aircraft.