CORPUS CHRISTI, Texas (AP) — A Navy helicopter on a training mission went down in a fiery crash near a 971-foot-tall antenna tower, killing three crew members and critically injuring a fourth, a Navy spokesman said Thursday.

Investigators were examining the wreckage Thursday, including a large piece that could be seen at the base of the tower. Authorities would not say whether the helicopter, an MH-53 Sea Dragon, hit the tower in the crash Wednesday night.

A radio station reported its sister television station was knocked off the air because of damage to the tower.