The neighbourhood of Forest Grove in Oregon has been haunted by a reoccurring noise at night.

The residents of Forest Grove began hearing the noise several weeks ago and all agree that it is a terrifying and awful sound.

Some describe the noise as a giant flute playing out of tune, while others say it sounds like faulty car brakes. The noise can last anywhere from a few seconds to several minutes.

The noise is loud enough to wake up residents and is reported to upset the street’s pets. The sound was reported to police but officers are baffled. They do not believe that someone is making the noise deliberately to upset people.

Officials have dismissed train tracks, water valves, gas leaks and wildlife as possible causes.

Some of the residents believe the sound is caused by an alien mother ship as a warning. Listen to the sound in the clip above!