LAS VEGAS (AP) — The highly decorated Army soldier inside a Tesla Cybertruck packed with fireworks that exploded outside Trump International Hotel in Las Vegas shot himself in the head just before detonation, authorities said Thursday.

The explosion caused minor injuries to seven people but virtually no damage to the hotel. Clark County Sheriff Kevin McMahill said Matthew Livelsberger, a Green Beret, likely planned a more damaging attack but the steel-sided vehicle absorbed much of the force from the crudely built explosive.

Damage from the blast was mostly limited to the interior of the truck because the explosion “vented out and up” and didn’t hit the Trump hotel doors just a few feet away, the sheriff said.