LAS VEGAS — The top lawman in Las Vegas said the gunman who killed dozens of people at a concert last month fired more than 1,100 rounds.

The newly released estimate from Sheriff Joe Lombardo offers more detail about the deadliest mass shooting in modern US history.

Lombardo told the Las Vegas Review-Journal he was aware of the previously unreported figure because his department’s forensics lab is working with the FBI to process all ballistics evidence.