Police used tear gas on the hundreds of civilians who gathered to celebrate May Day in Ankara on May 1, 2014. Police fired volleys of tear gas and jets of water on hundreds of protesters trying to march to Ankara’s Kizilay Square. Earlier, police in Istanbul used water cannon and tear gas against thousands of protesters who tried to defy a May Day ban on demonstrations. At least 50 people were injured. Hundreds of riot police moved on the crowd in an effort to breach the barricades leading to Istanbul’s Taksim Square, which has been the center of many of the anti-government protests in recent months. Adem Altan/AFP/Getty Armed protestors clash with police in front of the regional administration building in Donetsk, Ukraine on May 1, 2014. The clash came after a march by several hundred people carrying flags of the Donetsk People’s Republic, which represents a movement for greater autonomy from the central Ukrainian government or independence and possible annexation by Russia. Evgeniy Maloletka/AP A Pro-Russia activist wearing a riot police helmet shouted slogans outside the prosecutor’s office on May 1, 2014, while Pro-Russian protesters stormed the prosecutor’s office in the separatist-held city of Donetsk. They lobbed stones and smashed windows after accusing the office of working for the Western-backed government in Kiev. Marko Djurica/Reuters Pro-Russia activists stand guard at the entrance of the prosecutor’s office in Donetsk May 1, 2014. The separatists have siezed control of many of the government buildings in the city in their efforts to gain autonomy from the Ukrainain government. Marko Djurica/Reuters A May Day demonstrator throws a tear gas canister backat riot police during a May Day demonstration in Istanbul, Turkey. During the clashes, police used water cannons and tear gas on the protestors who defied a government ban and tried to march to the city’s iconic Taksim Square. (AP Photo/Emrah Gurel) Emrah Gurel/AP Pro-Russia activists burn Ukranian coat of arms outside the prosecutor’s office in the separatist-held city of Donetsk. Pro-Russian protesters stormed the prosecutor’s office in Donetsk Thursday, lobbing stones and smashing windows after accusing the office of working for the Western-backed government in Kiev. Marko Djurica/Reuters A pro-Russia activist tries to breathe after the police shot tear gas during an International Worker’s Day demonstration in Donestsk, Ukraine. The clash came after a march by several hundred people carrying flags of the Donetsk People’s Republic, a movement that seeks either greater autonomy from the central government, or independence and possible annexation by Russia. Manu Brabo/AP A man tries to protects himself as security forces beat him during the International Workers’ Day rally at Freedom Park in Phnom Penh, Cambodia. Pring Samrang/Reuters A protester throws stones at riot police during clashes at a May Day demonstration in Ankara, the capital of Turkey. Police fired volleys of tear gas and jets of water on hundreds of protesters trying to march to the Kizilay Square, which was declared off-limits for demonstrations. Adem Altan/AFP/Getty Turkish riot police fired water cannons and tear gas during a demonstration Thursday, injuring at least 50 people, to prevent hundreds of protesters from defying a ban on May Day rallies and reaching Istanbul’s central Taksim Square, the focal point of weeks of protests last summer. Serkan Senturk/Reuters