Seven children, ages 5-15, were killed in a raging fire that destroyed a Brooklyn home early Saturday morning, law-enforcement sources said. The mother of at least three of the children, and one other youngster, were critically injured. The fire started at 12:23 a.m. in the brick home on Bedford Avenue between avenues L and M in Midwood. FDNY firefighters worked to extinguish the blaze while Hatzolah and other paramedics frantically worked to keep the victims alive. “Two of the children weren’t breathing when they brought them out. The firefighters were running with them down the street on stretchers,” said a...