Sometimes cops shoot at other cops, too.

Sacramento County sheriff’s officials are breathing a sigh of relief after one of their own accidentally shot at—and narrowly missed—a fellow officer early Tuesday morning.

The friendly-fire incident occurred around 5 a.m. in Rancho Cordova, where a sheriff’s deputy assigned to the Rancho Cordova Police Department concluded a call involving an intoxicated subject.

As the officer left the subject’s apartment and entered a self-enclosed stairwell, he spotted someone standing at the bottom of the stairs that looked to be holding a weapon, according to a sheriff’s department release. The officer fired one round, which lodged into the stairwell’s door frame.

He then realized the person he shot at was another uniformed officer, who arrived to provide backup.

The release says the incident is being investigated by personnel from the department’s Executive Staff, Sheriff’s Training Academy, Detectives Division and Professional Standards Division.

The officer who discharged his weapon was described as a 10-year veteran of the department. It’s unclear whether he announced himself before firing his sidearm. A release from the Rancho Cordova Police Department says he’s been currently relieved of his assignment while investigators look into the shooting and “determine what, if any, administrative actions are necessary.”

A source within the department said the officer recently transferred to patrol.