Firefighters contain a blaze at an abandoned warehouse, the former Colonial Knife Co., at Agnes and Oak streets.

The Providence Journal / Steve Szydlowski

PROVIDENCE — A fire yesterday morning caused moderate damage to the first floor of a vacant warehouse at 28 Agnes St. in Olneyville, according to the Fire Department.

Firefighters were called to the property, which used to be part of the former Colonial Knife manufacturing company at Agnes and Oak streets at about 9:30 a.m.

Battalion Chief James Mirza said there was a fire in debris left by previous occupants. The smoke penetrated connecting buildings at the old industrial complex, he said, and it took firefighters 30 minutes to bring the blaze under control.

The cause of the fire is under investigation.

A firefighter suffered a pulled muscle.