NEW BEDFORD -- The cause of a fire late Friday night in a four-story mill building is under investigation, according to the New Bedford Fire Department.

The fire on the west side of the building at 27 Healey St. was first reported through 911 calls initially followed by a fire alarm activation, according to a post on the department's Facebook page.

"A large volume of fire had extended up the exterior wall of this four story mill building from a large loading dock which was used for storage. Interior fire attack crews located fire extending into the building on all four floors. A ladder company also reported the fire had extended onto the roof as well," according to the NBFD Facebook post.

The nearby residences did not suffer any fire damage. .

City of New Bedford Emergency Management, City of New Bedford Police Department (Official), New Bedford EMS, the Special Signal Fire Association / Providence Canteen, and the Massachusetts Department of Fire Services provided assistance on scene. No injuries were reported.

Mutual aid assistance was provided by Acushnet Fire and EMS, Fairhaven Fire-EMS, Dartmouth Fire District 1, and Dartmouth Fire District 2 .

The cause of the fire is being investigated by the NBFD Fire Investigation Unit and the state Fire Marshals Office.