New York City officials say it could be weeks before they know what caused a deadly construction crane collapse. Officials said Saturday they hope soon to recover the mobile crane's computer. It could provide some clues as to why the 565-foot-long boom toppled to the ground Friday morning in lower Manhattan. Officials say work crews will soon begin cutting the downed crane into as many as 35 pieces, then trucking them away. Officials hope to clear the damaged street by Monday morning. Wall Street worker David Wichs was killed in the collapse. Three other people were hurt by debris. The crane fell as it was being lowered amid roughly 20 mph winds in a snow squall.