A suspect in a series of stabbing attacks at a St. Cloud, MN, shopping mall Saturday night was killed inside the mall by an off-duty officer, according to St. Cloud police.

In a media briefing after midnight Sunday, St. Cloud police chief William Blair Anderson said an off-duty officer from another jurisdiction confronted and killed the suspect. He said the suspect — who was dressed in a private security uniform — reportedly asked at least one victim whether they were Muslim before assaulting them, and referred to Allah during the attacks, reports the Star Tribune.

Anderson declined to call the stabbing a terrorist attack, saying the motive for the attacks isn't known yet. "We will be diligent and get to the bottom of this," Anderson said, adding that St. Cloud Police had prior contact with the suspect, but only related to traffic stops.

"It's an awful day," Anderson said, adding that St. Cloud "won't be the same" after the attack.

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8 Stabbed in Minnesota Mall Attack, Suspect Killed