HARTFORD, Conn. (WTNH) — Multiple crews responded to an underground fire and manhole “explosion” in Hartford Thursday afternoon, according to Hartford police.

Witnesses told News 8 that they heard a “boom” that shook a building.

The fire was in the area of Farmington Avenue and Laurel Street. Hartford police said the cause of the blaze was determined to be an electrical fire. Officials said crews were able to extinguish the fire on Thursday evening.

Hartford Fire Chief James York said crews have not found any gas leaks and believe the issues are isolated to power and water. Eversource workers moved from manhole to manhole to check for the extent of the damage, which will determine how many people may have their power shut off.

“I’m hoping, I’m a tough mountain man,” said Don Moody, who lives nearby. “I’ll just throw on a couple of extra blankets, a couple of jackets and sweatshirts, and hang in there.”

Farmington Avenue is closed from Sigourney Street to Forest Street, and Laurel Street is shut down from Niles Street to Hawthorne Street due to the investigation.

This is a developing story. Check back for updates.