(FILES) In this file photo taken on October 06, 2017, Ethan Avanzino grieves beside a white cross for his friend Cameron Robinson, one of 58 victims of Sunday night's mass shooting, on the Las Vegas Strip just south of the Mandalay Bay hotel in Las Vegas, Nevada. No motive has yet been determined for last year's massacre of 58 people at an outdoor country music concert in Las Vegas, the deadliest mass shooting in recent US history, officials said Friday. Clark County Sheriff Joe Lombardo said Stephen Paddock, a 64-year-old former accountant, acted alone but the authorities do not know why he carried out the attack. / AFP PHOTO / Robyn Beck