There were no serious injuries Monday when fire broke out in a Jackson Street rooming house just before noon. Flames were shooting out of a third-floor dormer when firefighters arrived. The blaze is believed to have started in an unoccupied bedroom below and then stretched to the third-floor area which essentially attic space, said Deputy Fire Chief Jack Meaney. The bulk of the fire had been knocked down at 12:40 p.m. One firefighter suffered a hand injury battling the blaze and required stitches, Meaney said. Meaney said overall, "everything went well and the guys did a great job." The cause of the fire remained under investigation by Lawrence fire investigators and troopers assigned to the state fire marshal's office.