Smoking in a bedroom sparked an apartment building fire that displaced several families and cost $100,000 in damage, Montgomery County fire officials said Tuesday night.

The call went out at about 9 p.m. in the 100 block of Schuyler Road in Silver Spring for heavy fire on the first floor of a four-story apartment building.

The fire grew to two alarms. At least 85 firefighters responded.

At least one person was hurt. Several families will be displaced, said Pete Piringer, spokesman for the Montgomery County Fire & Rescue Service.

Fire investigators quickly determined smoking was the cause of the fire. It originated in a first floor bedroom.

An aerial look over the building from Sky9 showed several emergency vehicles on the scene—including ladder trucks, fire trucks, ambulances, and police.

Fire truck ladders were extended to help people out of the upper floors of the apartment building.

This story is still developing and will be updated as officials release more information.