As four armed anti-government protesters held their ground at a U.S. wildlife refuge in Oregon on Friday, the family of a protester killed by police said he seemed to have been shot in the back with his hands up, although authorities said he was reaching for a gun.

Relatives of Robert "LaVoy" Finicum, 54, a spokesman for the group that seized buildings at the Malheur National Wildlife Refuge, said he posed no threat and they were not accepting the authorities' assertion that he was armed.

The Federal Bureau of Investigation released video on Thursday of state police fatally shooting Finicum, and contended it showed him making a move for a gun in his coat pocket.