The Boeoegg, a snowman made of wadding and filled with firecrackers, burns on a bonfire in Sechselaeuten square in Zurich. Tradition says the faster the head of the "Boeoegg" catches fire and explodes, the warmer and more beautiful the summer will be.ReutersProtesters burn an effigy of US president Barack Obama in Manila to protest against his state visit to the Philippines.GettyPolice use a water cannon on "Bayan Muna" (My Country First) activists who tried to march to the American embassy in Manila to protest against the state visit by US President Barack Obama.ReutersAn armed pro-Russian man lends his weapon to a boy posing for a picture in front of the seized town administration building in Kostyantynivka, estern Ukraine.ReutersAn armed pro-Russian man stands guard at a barricade near the state security service building in Slaviansk. The sticker on the rifle reads: "Republic of Donetsk".ReutersA pro-Russian protester walks in front of riot police during a pro-Ukraine rally in the eastern city of Donetsk. Several people were wounded when what appeared to be stun grenades exploded during a rally in support of Ukrainian unity.ReutersPro-Russian (R) and pro-Ukrainian supporters clash in Donetsk, eastern Ukraine. Several people were wounded when pro-Russian separatists attacked a rally in support of Ukrainian unity.ReutersA wounded pro-Russian activist joins other activists after clashing with pro-Ukrainian supporters during a rally and march in Donetsk.GettyCommuters jostle for places on buses near Victoria station in London, during a planned 48-hour London Underground train strike.AFPVisitors look at a light show in the courtyard of the Hotel des Invalides in Paris.ReutersResearchers search for the remains of writer Miguel de Cervantes at Convento de las Trinitarias Descalzas in Madrid.GettyA US flag sticks out of the window of a damaged hot rod car in a suburban area affected by the tornado near Vilonia, Arkansas.ReutersA residential neighbourhood near Vilonia in Arkansas, destroyed by a tornado, is seen from the air.ReutersA school tie is left in tribute to stabbed teacher Anne Maguire on the fence outside Corpus Christi Catholic College in Leeds. A fifteen-year old male student has been arrested in connection with her killing.GettyA Muslim woman fleeing Central African Republic prays after a night on the road, before departing towards Chad, escorted by African Union peacekeepers.ReutersAnti-government protesters chain themselves to UN offices in Caracas, Venezuela.ReutersA damaged army vehicle is seen after after a suicide bombing at an army camp in Benghazi, Libya.ReutersA Free Syrian Army fighter fires his weapon during clashes with forces loyal to Syria's President Bashar al-Assad, in the old city of Aleppo.Reuters