The private helicopter with four people on board, including a child, either struck a cable or the tower, Houston Police Chief J. Noe Diaz said at a news conference.

The lights on a Houston radio tower were reportedly “unserviceable” a few days before a helicopter crashed into it killing four people in a fiery explosion.

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.