The Red Cross in Berks County is now helping two families displaced by a fire.

The fire started around 2:30 p.m. Sunday inside a vacant apartment on the first floor of 824 Franklin St. in Reading, officials said.

Everyone inside got out okay, but a firefighter was treated for a minor burn.

Investigators said the fire was intentionally set.

Anyone with information about the case is asked to call Crime Alert Berks County at 877-373-9913. A cash reward of up to $5,000 is being offered for information that leads to an arrest.