Body of husband , wife , 2 children found at Lakeland , Florida , Florida , officials say . Boy , 17 , was chased down street , fired at , but got away unharmed , officials say . Gunman used a high - powered rifle with ammunition , officials say .
Bodies of gunman , wife , 2 children found at Lakeland , Florida , home , officials say . Boy , 13 , was chased down street , fired at , but got away unharmed , officials say . Gunman used a high-powered rifle with scope , authorities say .