A Florida woman shot and killed her four children Tuesday before turning the gun on herself—just hours after she had unsuccessfully tried to kill the kids in their own house. The children, ages 12 to 17, had gone to a neighbor’s house for help before dawn after their mother shot them. The neighbor had heard the gunshots and called 911. But Tuesday morning, the mother approached the neighbor’s house calling for the children to come home, then fired fatal shots when they obeyed. The shooting took place in Port St. John , about 15 miles west of NASA’s Kennedy Space Center on Cape Canaveral.