Members of the media film soldiers atop a vehicle patrolling on a road at an area near clandestine graves at Pueblo Viejo, in the outskirts of Iguala, southern Mexican state of Guerrero October 10, 2014. Mexican authorities have found four more clandestine graves containing charred human remains at a site in the restive southwest of the country, where officials fear missing students were massacred by gang members and police. Attorney General Jesus Murillo said on Thursday the motive behind the apparent massacre of dozens of student teachers, who went missing after clashing with police in Iguala in the volatile, gang-ridden state of Guerrero on September 26, was not yet clear. REUTERS/Henry Romero (MEXICO - Tags: CIVIL UNREST CRIME LAW POLITICS EDUCATION MILITARY MEDIA)

Travis Beard, organizer of "Secret Cinema", screens a film at a secret cinema in Kabul December 8, 2011. In a dusty, dimly lit Kabul basement, British cinema fan club "Secret Cinema" launched their first movie event outside Britain on Thursday evening, bringing costume, audience participation and light-hearted mystery to the high-security Afghan capital. Picture taken December 8, 2011. REUTERS/Ahmad Masood (AFGHANISTAN - Tags: SOCIETY ENTERTAINMENT TPX IMAGES OF THE DAY)

An unidentified man helps with preparations before the start of a screening in Kabul December 8, 2011. In a dusty, dimly lit Kabul basement, British cinema fan club "Secret Cinema" launched their first movie event outside Britain on Thursday evening, bringing costume, audience participation and light-hearted mystery to the high-security Afghan capital. Picture taken December 8, 2011. REUTERS/Ahmad Masood (AFGHANISTAN - Tags: SOCIETY ENTERTAINMENT TPX IMAGES OF THE DAY)

Ignacio Jardon edits a video he took in Buenos Aires, October 3, 2008. Using hidden cameras and cheap bicycles as bait, an Argentine publicist set out to gauge crime in different neighbourhoods of Buenos Aires. The longer it takes for the bike to be stolen the safer the area, is his hypothesis. Picture taken October 3, 2008. REUTERS/Enrique Marcarian (ARGENTINA)