The soldier who was found dead in the Tesla Cybertruck that exploded on Wednesday outside the Trump International Hotel in Las Vegassuffered from post-traumatic stress disorder (PTSD) and “had no animosity towards the president-elect of the United States”, assured the F.B.I.

He reiterated that there is no “connection” between the Las Vegas blast and the New Orleans attack, in which 14 people died.

Police officials announced Thursday that 37-year-old Matthew Leivelsberger, a decorated Special Forces soldier from Springs, Colorado, shot himself in the head.

The attacker had “no animosity toward the president-elect of the United States,” FBI agent Spencer Evans said at a news conference. From the data of the investigation and information from the army, it appears that “he probably suffered from PTSD”, while “there were other issues of a family nature or personal bitterness” that may have been factors that contributed to his decision. He emphasized that everything indicates that this is a “tragic incident of suicide”.

Investigators found two letters in which Leivelsberger expressed “political grievances,” Assistant Sheriff Dory Coren said.

In excerpts of the letters that saw the light of dayLeivelsberger writes that the US is suffering from a “deadly disease” and is “heading for collapse.”

Claiming that this is not a “terrorist attack” but a “wake-up call”, the 37-year-old explains that he planned the explosion because “Americans only care about spectacle and violence”.