Investigators announced Thursday the cause of a fertilizer plant blast in West, TX is undetermined, but they have not ruled out the possibility of arson.
Officials said there are three causes they cannot rule out: 120 volt electrical system at plant, a golf cart, an intentionally set fire.
Authorities said they didn't have enough pieces of the battery-operated golf cart or the building structure containing the electrical system to completely rule them out as causes.
The investigation has been challenging due to the sheer impact of the blast itself. The two consecutive explosions at the plant last April was the equivalent of 15-20,000 pounds of TNT according to officials.
Authorities also declined to speculate whether the arrest of ex-West EMT Bryce Reed was linked to the blast at the plant. Reed was arrested for possessing materials to make a pipe bomb, but his hearing this week was postponed.
People in West say they're still left looking for answers.
"It's still kind of in limbo though because you don't know how it all started," Peggy Martin, West resident, said. "Hopefully it was just a very unfortunate thing and hopefully it wasn't something that - I know there was a guy arrested."
Fourteen people died in the explosion in West.