The man accused of killing 10 people in a mass shooting at a south Boulder grocery store on Monday bought the weapon in Arvada, a source on the investigation confirmed Friday.

The suspect, identified as Ahmad Al Aliwi Alissa, 21, has been charged with 10 counts of first-degree murder after deliberation and one count of attempted murder.

According to an affidavit, Alissa was found with two weapons at the scene of the shooting, including an AR-556 that records show he had purchased on March…

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