A four-alarm fire at a duplex on Redwood Avenue displaced 29 people early Saturday morning, according to the Passaic County Prosecutor’s Office.

Firefighters responded to the fire at 86-88 Redwood Avenue at around 3:47 a.m. Two other buildings at 90 and 92 Redwood Avenue sustained water and smoke damage as a result of the fire.

No one was injured in the fire.

Cause of the fire remains under investigation.