Lisbon Street in Lewiston is back open after a three-alarm fire at LePage Bakery Monday morning. Credit: Lexie O'Connor | CBS 13

Lisbon Street in Lewiston is back open after a three-alarm fire at LePage Bakery Monday morning.

A passerby reported flames coming from roof around 3:15 a.m.

It took crews about 20 minutes to get the flames under control.

Officials say about 40 employees were inside at the time of the fire. No one was hurt.

Fire investigators say the fire was accidental, and started in a doughnut machine in the basement.