A dog called Denise jumps through the water as it chases a ball in a lake in Duisburg, Germany, Tuesday, May 20, 2014. Temperatures in Germany reached 29 Celcius (84F), the hottest day of the year so far.
Two Northrop F-5E Tiger II airplanes of the Swiss Patrol fly close together during an aerobatic performance at the ILA Berlin Air Show in Berlin, Germany, Tuesday, May 20, 2014. The Berlin Air Show takes place from May 20 until May 25, 2014 .
A Kenyan student is detained by riot police after surrendering in order to escape from a tear-gas-filled building inside Nairobi University's main campus in downtown Nairobi, Kenya Tuesday, May 20, 2014. Kenyan university students on Tuesday carried out demonstrations over a proposed increase in student fees, but the protests quickly turned into hours of running battles between students throwing rocks and security forces firing tear gas, before riot police chased the students inside their campus and cornered them in a building into which they fired dozens of tear gas grenades and for a while prevented anyone from leaving.
A train conductor stands at a door of a damaged railway car at the site of train collision near the city of Naro-Fominsk outside Moscow Tuesday May 20, 2014. The Interior Ministry said the accident happened when several cars of a cargo train derailed and hit a passenger train near Naro-Fominsk, a town 50 kilometers (30 miles) southwest of Moscow.
Members of the guard of honor prepare for the arrival of Swiss Federal President Didier Burkhalter and Italian President Giorgio Napolitano on the Muenster square during Napolitano's state visit to Switzerland, in Bern, on Tuesday, May 20, 2014.
A Ukrainian coal miner sits on a bus after finishing his shift at a coal mine outside Donetsk, Ukraine, Tuesday, May 20, 2014. While steel worker in Mariupol joined anti-separatist actions supported by the management of the plants, miners refused to take part in a planned protest against the Donetsk People's Republic.