2014 Event Ukrainian President Petro Poroshenko initiates a 7-day cease-fire, allowing troops to defend themselves but not to attack; during the cease-fire, separatists can turn in weapons and receive amnesty; so far, rebels have rejected the offer 2013 Event In Wisconsin, two planes carrying nine skydivers collide in midair; the skydivers used their parachutes to steer themselves clear of the debris, and the two pilots survived with minor injuries 2011 Event Libya's military claims it will stop fighting Sunday to allow the rebels to turn themselves in 2010 Event President of Iran Mahmoud Ahmadinejad calls for 'alien troops' to leave and suggests that the regional nations be allowed to settle things themselves 1999 Event Two disaffected students brought guns to their high school in Columbine, Colorado and murdered twelve students, one teacher and then killed themselves 1971 Event 29 pilot whales beach themselves and die at San Clemente Island, California 1961 Event U.S. members of Communist Party obliged to report themselves to Police 1915 Event Theodore Roosevelt criticizes U.S. citzens who identify themselves, with dual nationalities 1349 Event Jews of Cologne Germany set themselves on fire to avoid baptism