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The FBI and ATF are assisting in the investigation.

State Sen. Martín Quezada said he happened to be at the mall and witnessed the attack.

\"I just witnessed an armed terrorist with an AR-15 shoot up Westgate. There are multiple victims,\" he wrote on Twitter.

I saw 2 victims with my own eyes. Not sure how many others I saw the shooter. Being told not to say anything else about details 'til I speak to police. I'm ok. Lots of shaken up people.

— Sen. Martín Quezada (@SenQuezada29) May 21, 2020

\"I saw 2 victims with my own eyes,\" Quezada added. \"Not sure how many others I saw the shooter. Being told not to say anything else about details 'til I speak to police. I'm ok. Lots of shaken up people.\"

Indoor malls in Arizona began to reopen on May 16 amid the COVID-19 pandemic. Outdoor malls began reopening about a week earlier.

ABC News' Alex Stone and Josh Margolin contributed to this report.

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