The US Army veteran suspected of detonating a Tesla Cybertruck outside the Trump International Hotel in Las Vegas was a supporter of the Ukrainian nationalist cause, according to a photo posted on Facebook.

Thirty-seven-year-old Matthew Livelsberger was killed and seven bystanders injured when the Cybertruck he was driving exploded outside the hotel on Wednesday. Tesla CEO Elon Musk attributed the blast to explosive materials transported in the truck’s bed, and the FBI is investigating the incident as a potential act of terrorism due to its proximity to the Trump International Hotel and a similar attack in New Orleans earlier that day.

In a photo purportedly shared by Liveslberger’s wife on Facebook in 2016, the former soldier can be seen wearing a t-shirt emblazoned with a Ukrainian coat of arms and the slogan “Slava Ukraini,” or “Glory to Ukraine.”