Officials surveying the aftermath of a deadly helicopter crash in Houston on Sunday are looking into the possibility that the aircraft struck a radio tower because its warning lights were not working.

A helicopter crashed into a radio tower near downtown Houston Sunday night, killing four people on board, including a child, fire officials said.

Four people were killed, including a child, when a helicopter slammed into a radio tower behind homes in Houston’s Second Ward, causing a fiery explosion and toppling the structure and scattering debris through the neighborhood,