Firefighters worked into the early morning hours Thursday to quell a fire that caused substantial damage to an energy business facility in Milton.

Crews worked until about 1:30 a.m. putting out spot fires at the Frank’s International workshop at 1724 E. Milton Ave. after a large fire ignited around 8:20 p.m. on Wednesday in a rear workshop area, said Alton Trahan, Lafayette Fire Department spokesperson.

He said it took about an hour for firefighters to suppress the large fire. In addition to Lafayette, firefighters from Youngsville, Broussard, Judice, Carencro, Scott and Duson were involved in battling the blaze.

An employee said he heard a loud noise coming from the 600-square-foot workshop — which is used for cutting, sandblasting, cleaning and repairing equipment — after employees had been working there in the afternoon, Trahan said. The employee called 911 after noticing smoke and flames coming from the shop.

The cause of the fire is under investigation.

The facility is the former site of Timco Services, which is now under Frank’s International ownership.