A member of Salt Lake County's SWAT team left an M4 assault rifle in front of someone's home after leaving the scene of a standoff in the township of White City.

Salt Lake County Sheriff's Deputy Levi Hughes says the gun was left by a veteran member of the SWAT team who forgot the weapon in the grass while packing up gear after the standoff ended.

A homeowner found the rifle in the front yard of a house a few hours later and notified authorities. Hughes says an officer on patrol stopped by the home and recognized the rifle as a weapon belonging to the SWAT team.

Hughes says leaving the gun behind was an unacceptable, terrible mistake. Hughes says the officer will face disciplinary action, but probably won't be fired.