3 things to know about the Austin mass shooting suspect, possible terror ties

1. Investigators reviewing evidence of 'potential nexus to terrorism'

During a Monday news conference, Alex Doran, the acting special agent in charge of the FBI's field office in San Antonio, said investigators found "indicators" on Diagne and in his vehicle that point to a "potential nexus to terrorism.”

Doran also stated during the news conference that authorities have yet to determine the shooter’s exact motive. The acting special agent later told reporters that the FBI’s Joint Terrorism Task Force is involved in the investigation, in addition to several federal, state and local partners. 

CBS News reported this week that officials discovered an Iranian flag and pictures of Iranian leaders after executing a search warrant at Diagne’s home on Sunday. Sources also reportedly told the outlet that the gunman had a Quran in his vehicle. 

The network also showed a photo it obtained of Diagne wearing a hoodie that said “Property of Allah,” which two sources familiar with the investigation said the shooter wore during the attack. The photo obtained by CBS News shows an Iranian flag shirt that Diagne wore underneath the hoodie.

During the Monday news conference, Austin Police Chief Lisa Davis said that the guns Diagne used in the attack — a handgun and a rifle — were acquired legally in San Antonio in 2017. 

Authorities are looking into several potential motives, including a possible link to terrorism. According to an NBC News report, four sources briefed on the shooting investigation are exploring whether mental health issues might have played a role in the attack.