Witnesses tell a local TV news channel that they had heard what they believed to be eight to 12 gunshots.
A gunman who shot a number of people at a mall in a suburb of Wisconsin is still on the run.
Wauwatosa Mayor Dennis McBride said the victims were left with non-life threatening injuries following the incident at the Mayfair Mall.
Witesses told WISN-TV that they had heard what they believed to be eight to 12 gunshots.
WISN reported that at least five people were taken away from the mall on stretchers, at least two of whom were sitting upright and appeared to be conscious.
Some people remained in the mall while police searched for a suspect.
Mall operator Brookfield Properties said in a statement they were “disheartened and angered that our guests and tenants were subject to this violent incident today”.
The Mayfair Mall was the site of a February shooting in which a city police officer, Joseph Mensah, shot and killed Alvin Cole, a black 17-year-old.
Officers said Cole was fleeing from police. Mensah, who is also black, said he shot Cole because he pointed a gun at him.
The mall was the target of sporadic protests over several months in the wake of the shooting.
The Milwaukee County district attorney declined to file charges against Mensah, but the city this week agreed to a separation agreement in which he will be paid at least $130,000 to leave the force.
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