Firefighters in Derby battled an early morning fire that forced people out of their homes.
They said it broke out at a building on Derby Avenue around 2:30 a.m.
The building was described by the fire department as mixed use, containing both residential and commercial space.
Crews from surrounding towns, including Ansonia and Shelton, were called in to help knock the fire down.
When they arrived, they said they found heavy smoke coming from the first and second floors.
"We were able to put [it out] quick, knock down the fire," said Chief Mike Goodman, Derby Fire Department. "But the construction of the building made it more difficult with the older framing and everything so it was a little more persistent to put out."
The fire was under control after about 45 minutes, firefighters said.
Reports were that there were people trapped on the second floor.
It's unclear how many people were in the building, but firefighters said everyone made it out safely.
The Red Cross is helping the people who were displaced.
No one was hurt.
Crews determined the the fire started on the first floor and spread to the second.
A cause remains under investigation.
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