A man who made "some references to Allah" stabbed and injured eight people in a shopping mall in the city of St. Cloud late Saturday before he was shot dead by an off-duty officer, police said.
The suspect "asked at least one person if they were Muslim before he assaulted them," Blair Anderson, the St. Cloud police chief, told journalists.
But he emphasized that the assailant's motivation remained unclear.
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"Whether that was a terrorist attack or not, I'm not willing to say that right now because we just don't know," he said.
Local officials had no immediate response to a claim by the IS-linked news agency Amaq that the assailant was "a soldier of the Islamic State."
A St. Cloud police officer said on Sunday that the department was actively investigating the attack, but had no further information for public release and had no immediate plans for further news briefings.
Speaking shortly after midnight, Chief Anderson said the armed suspect entered the Crossroads Center mall in St. Cloud -- a city of about 67,000 people some 70 miles (110 km) northwest of Minneapolis -- and attacked at least eight people.
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The lone suspect was wearing a private security uniform and had at least one knife, and "made some references to Allah," the police chief said.
"That suspect was confronted by an off-duty police officer and summarily shot and killed," he said.
Anderson said the eight injured people were taken to a hospital. All but one was later released.
The suspect had a history of minor traffic violations, Anderson said, adding that police do not currently believe the attack was connected to any other incident.
The Minnesota attack came as 29 people were injured in a deliberate explosion in a busy New York neighborhood late Saturday. Mayor Bill de Blasio said there was currently no known link to international terror.
Democratic presidential candidate Hillary Clinton said she had been briefed about the Minnesota stabbing as well as Saturday's explosions in New York, as well as a pipe bomb blast hours earlier in a trash can in New Jersey in which no one was injured.
The St. Cloud mall will remain closed as police continue their investigation.
"It's an awful day," Anderson said. "Starting tomorrow things won't be the same here."
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