An Arizona man accused of selling armour-piercing bullets to a Las Vegas gunman who killed 59 people, including three Canadians, was charged on Friday with conspiracy to manufacture and sell such ammunition without a license, federal prosecutors in Nevada said.

Douglas Haig, 55, of Mesa, Ariz., became the first person arrested and charged in connection with the Oct. 1, 2017, massacre, which ranks as the deadliest mass shooting in modern U.S. history.

The gunman, Stephen Paddock, who strafed a crowd of concert-goers from his high-rise hotel suite, killed himself as police closed in on his room.