The Austin Police Department is holding a news conference Thursday afternoon to provide more details about the deadly shooting over the weekend that left three victims and the shooter dead.

The suspect, identified as 53-year-old Ndiaga Diagne, was killed in a shootout with police. He was wearing a shirt emblazoned with a design similar to the Iranian flag under a hoodie that said “Property of Allah.” 

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Photo at left shows the gunman in the Austin, Texas bar shooting wearing a “Property of Allah” hoodie. At right, a photo obtained by CBS News shows the Iranian flag shirt he was wearing underneath, after he was killed by police.

Left: Fox News; Right: Obtained by CBS News

The FBI has been investigating the shooting for possible ties to terrorism. Sources familiar with the investigation told CBS News that  the war in Iran, at least in part, appeared to have been a factor in the attack. The shooting took place shortly after U.S. and Israeli forces launched a massive wave of airstrikes that killed top regime leadership and destroyed Iranian military targets.

Authorities also found that Diagne had a history of antisemitic, anti-Christian and pro-Iranian posts on social media. Sources familiar with the investigation also said Diagne had a history of mental health issues. In one encounter with police in Texas, officers responded because he was suicidal, according to law enforcement sources. 

U.S. officials say he was an immigrant from Senegal who came to the U.S. in 2000 and became an American citizen in 2013.Â