WEST, TX (KVEO NEWS CENTER 23) — The cause of the fertilizer plant explosion in West is now a criminal investigation.
Fourteen people were killed last month when the facility caught fire and exploded.
The state fire marshal's office said monday it has ruled out four possible causes. The department of public safety says they don't want to leave stones unturned. Investigators have interviewed more than 400 people trying to figure out exactly where the fire started and its cause.