The mystery over why an Army Special Forces soldier detonated his Cybertruck outside the Trump Las Vegas hotel on New Year’s Day was only deepened by the final investigative report from local cops on Monday.

The 70-page Las Vegas Metropolitan Police after-action dossier confirms that Matthew Livelsberger, 37, an active member of the elite Green Berets, left a “manifesto” on his phone, but the Department of War has deemed it classified and will not release it.

Livelsberger loaded the truck with fireworks, gas tanks and camping fuel — and detonated it outside the lobby of the Trump property on the Vegas strip.

He “simultaneously” shot himself as the truck began to burn, authorities said.

The blast injured six people inside the hotel.

Despite the War Department’s decision to keep

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