tear gas

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 Read more

Two riot police officers sit with anti-government protesters on the stairs of the National Broadcasting of Thailand (NBT) building after protesters entered the compound during a rally Friday, May 9, 2014 in Bangkok, Thailand. Thai police fired tear gas and water cannons Friday to push back hundreds of protesters trying to force their way into a government compound, the latest indication that ousting the premier will not solve the country's tense political crisis. (AP Photo/Apichart Weerawong)

Apichart Weerawong/AP

Two riot police officers sit with anti-government protesters at the National Broadcasting of Thailand building after protesters entered the compound during a democracy rally in Bangkok, Thailand. Thai police fired tear gas and water cannons on Friday to push back hundreds of protesters trying to force their way into a government compound, the latest indication that ousting the premier will not solve the country’s tense political crisis. Read more

Turkish protesters run for cover as riot police fire tear gas to disperse a May Day rally near Taksim Square in Istanbul on May 1, 2014. Turkish police used water canon and tear gas to disperse thousands of protesters who tried to defy a Labour Day ban on demonstrations on Istanbul's Taksim Square, the scene of protests that have dogged the government for months.

Bulent Kilic/AFP

Turkish protesters run for cover as riot police fire teargas to disperse a May day rally near Taksim Square in Istanbul on Thursday, the scene of protests that have dogged the government for months

Family members run away from tear gas during clashes between Egypt's security forces and supporters of ousted President Mohammed Morsi in Cairo, Egypt, Friday, Jan. 17, 2014. Morsi supporters held sporadic protests against this week's constitutional referendum as authorities said there was a deadly clash.

Aly Hazzaa/AP

Family members run away from tear gas during clashes between Egypt’s security forces and supporters of ousted President Mohammed Morsi in Cairo, Egypt

Supporters of Egypt's ousted President Mohammed Morsi chant slogans against Egyptian Defense Minister Gen. Abdel-Fattah el-Sissi during clashes with Egyptian security forces in Cairo's Mohandessin neighborhood, Egypt, Wednesday, Aug. 14, 2013. Egyptian security forces, backed by armored cars and bulldozers, moved on Wednesday to clear two sit-in camps by supporters of the country's ousted President Mohammed Morsi, showering protesters with tear gas as the sound of gunfire rang out at both sites.

Hassan Ammar/AP

Supporters of Egypt’s ousted president Mohamed Morsi chant slogans against the country’s defence minister General Abdel Fattah al-Sisi during clashes with Egyptian security forces in Cairo’s Mohandessin neighbourhood on Wednesday. Egyptian security forces, backed by armoured cars and bulldozers, moved on Wednesday to clear two sit-in camps of supporters of Mr Morsi, firing tear gas at protesters as the sound of gunfire rang out at both sites.

Supporters of deposed Egyptian President Mohamed Mursi run from tear gas fired by riot police during clashes on the Sixth of October Bridge over the Ramsis square area in central Cairo...Supporters of deposed Egyptian President Mohamed Mursi run from tear gas fired by riot police during clashes on the Sixth of October Bridge over the Ramsis square area in central Cairo July 15, 2013. Police fired tear gas in central Cairo on Monday when protesters calling for the reinstatement of the ousted Islamist president, Mohamed Mursi, scuffled with drivers and passers-by annoyed that they had blocked major roads. REUTERS/Amr Abdallah Dalsh  (EGYPT - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)

Amr Abdallah Dalsh/Reuters

Supporters of Mohamed Morsi, the deposed president of Egypt, run from tear gas fired by riot police during clashes on the Sixth of October Bridge over the Ramsis square area in Cairo. Police moved in when protesters, calling for the reinstatement of Mr Morsi, scuffled with drivers and passers-by who became annoyed by the road being blocked Read more

A protestor flashes V sign in front of burning excavations during a clash with Turkish riot police at Taksim Square in Istanbul, Turkey, 11 June 2013. Turkish Prime Minister Recep Tayyip Erdogan  defended the police's latest show of force against demonstrators, as numerous arrests and injuries were reported in Turkey on 11 June after police and anti-government protesters clashed anew across Istanbul and authorities deployed tear gas, water cannon and armoured vehicles to clear demonstrators. In Istanbul's Taksim Square, which has become the centre of the anti-government protests, police moved in from the city's Besiktas district in the early morning, when only a few thousand demonstrators remained on the square after more than a week of occupation. Anti-government protests started there as a demonstration against a building project in the square's Gezi Park but have since grown into widespread condemnation of the government's conservative policies.

Tolga Bozoglu/EPA

A protester stands defiantly in front of burning wreckage during a clash with Turkish riot police at Taksim Square in Istanbul on Tuesday evening. Read more

Masked policemen take cover behind shields during clashes at a May Day demonstration on May 1, 2013, in Istanbul.  Several people were injured on Wednesday as Turkish riot police used water canon and tear gas to disperse hundreds of protesters who defied a May Day ban on demonstrations in a central part of Istanbul.

Ozan Kose/AFP

Masked police officers take cover behind shields during clashes at a May Day demonstration in Istanbul. Several people were injured on Wednesday as Turkish riot police used water canon and teargas to disperse hundreds of protesters who defied a May Day ban on demonstrations in a central part of Istanbul, Turkey.