PORTLAND, Maine — Firefighters are trying to determine how a fire started inside a Portland apartment building. Fire crews were called to the fire on Greenleaf Street early Monday evening.

Firefighters say no one was hurt and everyone was outside by the time they arrived.

But initially there were concerns a child was still inside.

“We arrived, we got a report there might be a little girl missing. We had crews immediately get on the second and third floor, and ensure that there was nobody in the building, so it was a priority as soon as we got here to take care of that,” Deputy Chief Shawn Neat of the Portland Fire Department said.

Firefighters say the fire caused significant damage to the second and third floors of the apartment building.

The American Red Cross says at least 12 people are believed to have been affected by the fire. The agency planned to provide financial assistance to ensure the victims have food, clothing and emergency shelter.

Firefighters say it’s too early to tell how the fire started.