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The state fire marshal’s office was called to a house on Gale Street in Waltham for the second time in less than two weeks on Thursday to investigate a second possible Molotov cocktail incident there. The fire marshal investigated the first incident at 44 Gale St. on Aug. 27, after reports of a suspicious object there that morning. No one was injured in the fire, but the house’s vinyl siding was slightly damaged, said Waltham police Detective Sergeant Tim King. Residents of the house again called police just before 12:30 a.m. Thursday after a burning odor led them outside to a small ground fire surrounded by broken glass, King said.