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A performer greets arrivals to the 41st Annual Conservative Political Action Conference at the Gaylord National Resort & Convention Centre in National Harbor, Maryland, USA
A morning commuter walks through the snow in the US city of Philadelphia, on Thursday
A snow plow clears downtown lanes on Interstate 75/85 during a winter storm on Wednesday in Atlanta.
Team USA huddles around the net before the game against Switzerland during the 2014 Winter Olympics women’s ice hockey game at Shayba Arena, Sochi, Russia Read more
US President Barack Obama endorses the National Day of Prayer by attending the celebratory breakfast in Washington, DC, on Thursday
A man walks past a sculpture covered by a light dusting of snow in the US city of Baltimore
North America has been hit by the coldest temperatures in decades after a a polar vortex led to extreme weather conditions. In Baltimore, temperatures remain well below freezing, with ice forming on buildings, cars and roads.
Visitors walk through the holiday lights display “ZooLights” at the Lincoln Park Zoo in Chicago, Illinois.
John Moore/Getty Images
Protesters chained together block the entrance of an immigrant detention centre on Tuesday in Elizabeth, New Jersey. A coalition of immigrant advocacy groups marked international Human Rights Day by staging the civil disobedience action at the Elizabeth Detention Center where eight protesters were arrested by police. Organisers said the event was designed to draw attention to the continued mass deportations of undocumented immigrants by the US Immigration and Customs Enforcement, as well as Congress’s inability to pass immigration reform.