LOS ANGELES: The decorated Green Beret, who died by suicide in a blazing Cybertruck outside a Trump hotel in Las Vegas, was suffering from posttraumatic stress disorder (PTSD), investigators said on Friday, adding that they had found no links to `terrorist` groups.

Matthew Livelsberger, 37, a member of the elite US special forces, shot himself on NewLOS ANGELES: The decorated Green Beret, who died by suicide in a blazing Cybertruck outside a Trump hotel in Las Vegas, was suffering from posttraumatic stress disorder (PTSD), investigators said on Friday, adding that they had found no links to `terrorist` groups.

Matthew Livelsberger, 37, a member of the elite US special forces, shot himself on NewYear`s Day in the rented Tesla vehicle filled with fuel containers and fireworks, which exploded.

Seven people nearby in the valet area of the glass-fronted Trump International Hotel were wounded in the blast.

`Although this incident is more public and more sensational than usual, it ultimately appears to be a tragic case of sui-cide involving a heavily decorated combat veteran who was struggling with PTSD and other issues,` FBI Special Agent Spencer Evans told a press conference.

Investigators said they were still examining Livelsberger`s devices but that so far, they had found two letters on his phone in which he spoke of the `burden` of having taken lives, amongother issues.

`[W]e`re also aware that there were potential other family issues or personal grievances in his own life that may have been contributing factors,` the FBI official pointed out.

He said investigators have `not identified any connection between this subject and any other terrorist organisation.

-Agencies