the European Financial Stability Facility, and the International Monetary Fund. The deal precipitates a banking crisis in the island nation. April April 2 – The United Nations General Assembly adopts the Arms Trade Treaty to regulate the international trade of conventional weapons. April 13 Venezuelan presidential election, Nicolás Maduro was declared winner with a narrow victory over his opponent Henrique Capriles Radonski. Venezuelan presidential election protests. April 15 – Two Chechnya-born Islamist brothers (1 of whom was a United States citizen) detonate 2 bombs at the Boston Marathon in Boston, Massachusetts, in the United States, killing 3 and injuring 264 others. April 20 – A magnitude 6.6 earthquake jolts Sichuan, China, leaving 193 people dead and more than 11,000 injured. April 21 – Businessman Horacio Cartes wins the 2013 Paraguayan general election against Efraín Alegre. April 24 – The 2013 Savar building collapse, one of the worst industrial disasters in the world, kills 1,134 people in Bangladesh. April 30 – Willem-Alexander is inaugurated as King of the Netherlands following the abdication of Beatrix. May May 14–18 – The Eurovision Song Contest 2013 takes place in Malmö, Sweden, and is won by Danish entrant Emmelie de Forest with the song "Only Teardrops". May 15 – In a study published in the scientific journal Nature, researchers from Oregon Health & Science University in the United States describe the first production of human embryonic stem cells by cloning. The World Health Organization names the novel coronavirus Middle East respiratory syndrome (MERS). May 22 – British Army soldier Fusilier Lee Rigby of the Royal Regiment of Fusiliers is murdered in Woolwich, southeast London by Islamic terrorists Michael Adebolajo and Michael Adebowale. May 31 - The largest tornado ever recorded hit El Reno.This rain-wrapped, multiple-vortex tornado was the widest tornado ever recorded. Remaining over mostly open terrain, the tornado did not impact many structures; however, measurements from mobile weather radars revealed extreme winds up to 296 mph (476 km/h) within the vortex. These are among the highest observed wind speeds on Earth, just slightly lower than the wind speeds of 1999 Bridge Creek–Moore tornado. As it crossed U.S. 81, it had grown to a record-breaking width of 2.6 miles (4.2 km). June June 6 – Former CIA employee Edward Snowden discloses operations engaged in by a U.S. government mass surveillance program to news publications and flees the country, later being granted temporary asylum in Russia.