LYNN – Lynn firefighters bookended the weekend extinguishing a fire at a vacant residence Friday night and a fire at a commercial building early Sunday morning.Lynn District Fire Chief Steve Archer said fire crews responded at about 10:30 p.m. Friday to reports of a working fire in a home at 56 Sewell St., which he said was unoccupied.Firefighters found heavy smoke coming out of the second floor, so they stretched a hose to the second floor and broke through a window to get in. They found a fire mostly confined to a closet in a second-floor bedroom and put it out in less than an hour.Archer said he doesn’t have estimate on damages the fire caused but said the second floor has heavy smoke and water damage, and the first floor has some water damage from the fire hose.Archer said fire crews are investigating the cause of the fire.He said the fire department was able to locate the owners of the home, who were not living in the home at the time.Lynn Fire Department also responded to a fire in a building with two businesses – an auto body and a welding shop – at 22 Bennett St. early Sunday morning. District Chief Bob Bourgeois said firefighters received a call at 2:46 a.m. Sunday and forced their way into the building to find that a car burning inside the building. He said the car and its contents as well as some other contents of the building were burned, and the building had smoke damage as well. He said nobody was injured in the blaze, as the shops were closed, and the cause remains under investigation.A number for Perotti’s Welding and Fabrication, one of the tenants, was disconnected Sunday. A message left at Munoz Auto Repair, the second tenant, was not returned.Bourgeois said the working fire was a “quick knockdown” with the blaze declared under control at 3:11 a.m. Sunday.Amber Parcher can be reached at [email protected]. Cyrus Moulton can be reached at [email protected].