The National Transportation Safety Board on Tuesday released photos of the helicopter crash that killed six people south of Las Vegas on Friday.

The Airbus EC130 aircraft was heading to Boulder City from Palm Springs, California, when it crashed near Halloran Springs, California, about 80 miles south of Las Vegas.

News reports have identified four of the six victims as Herbert Wigwe, CEO of one of Nigeria’s largest financial institutions, Access Bank; Wigwe’s wife and his son; and Bamofin Abimbola Ogunbanjo, former chair of NGX Group, the Nigerian stock exchange.

NTSB investigators arrived at the crash site on Saturday evening to collect evidence.

NTSB official Michael Graham told the Las Vegas Review-Journal last week that preliminary report of the crash is expected in the coming weeks, Graham said.