Morgan & Morgan has filed the first lawsuit over damages caused by dozens of gas explosions that rocked Massachusetts last week.

The law firm filed the class action on Tuesday in Essex County Superior Court in Massachusetts on behalf of residents of the Merrimack Valley region, including the 8,600 forced to evacuate after gas line operator Columbia Gas of Massachusetts shut off their pipes. The explosions, which occurred on Sept. 13 in the towns of Andover, North Andover and Lawrence, killed one teenager and injured more than 20 others.