HATBORO, Pa. (WPVI) -- An investigation is underway into the cause of a fire inside a bank in Hatboro, Montgomery County.
It all began just before 11:30 a.m. Saturday at the Hatboro Federal Savings Bank.
"The initial tack crews went into the basement, found heavy fire in the mechanical room and there was a minor explosion," said Chief James Anders III, Enterprise Fire Company.
Crews pulled back since they weren't sure what caused the explosions.
Because of the heat more than 30 companies responded to help rotate out firefighters.
Meanwhile businesses and residences along South York and Byberry Roads were evacuated.
"It's undetermined what the cause is right now. We're monitoring the CO levels and high explosive levels inside the buildings," said Chief Anders.
The fire response blocked traffic to much of Hatboro's main business district for the entire afternoon.
Crews were able to put out the fire.
The incident is under investigation.