A woman was killed in a Montvale house fire Sunday afternoon, according to the Bergen County Prosecutor’s Office.

News 12 is told that a passerby spotted smoke, and Montvale firefighters were called to the scene at 53 North Ave. around 1 p.m.

Other crews had to be called in as flames caused extensive damage to the home.

There were no reports of any injuries to firefighters.

The woman has not been identified. Authorities described her as elderly.

The cause of the fire is under investigation.