“Somebody came running in with a weapon,” one person called 911 to report at around 20:44 local time.
Police from several departments converged on the mall in the city of Novi, not far from Detroit, shooting their emergency lights at passing vehicles in a desperate scramble to end the standoff.
At one point, sources within the county jail told NBC News the suspect was being held in the security area for homicide arrests. The sheriff said during the standoff that “that’s a place of concern for us”, though the sheriff’s office had not clarified if this was related to the ongoing hostage situation.
Within half an hour of the first 911 call, a SWAT team with a robotic camera climbed onto the roof of the building on the second floor to evaluate the scene.
The standoff was one of the latest to hit the US since a spate of mass shootings began in the US in 2012. The deadliest took place at the Pulse nightclub in Orlando, Florida, when 49 people were killed in June 2016.
Sources in Novi later stated that no harm had been caused to those who entered the mall. At 22:57 local time, Novi Police Chief Bob Basta told reporters that all the hostages had been released.
The department reported on their Facebook page that the scene was over at 22:49 local time. They added that two helicopters had arrived, along with multiple ambulances, for those who had been injured.