The Tesla Cybertruck explosion and fire at the entrance of the Trump Hotel in Las Vegas Wednesday morning is being investigated as a possible terrorist act, according to a law enforcement official who has been briefed on the investigation.

They also showed video evidence of him preparing for the explosion by pouring fuel onto the truck while stopped before driving to the hotel. He’d also kept a log of supposed surveillance, although the officials said he did not have a criminal record and was not being surveilled or investigated.

The explosion was caused by fireworks and explosives in the bed of the rental Cybertruck, which had no faults, according to data.