The man suspected in Saturday's fatal shooting of six people in Kalamazoo County, Michigan, was an Uber driver who had passed a background check, the company told CNN.
Police announced Sunday that 45-year-old Jason Brian Dalton has been taken into custody. Authorities are trying to determine whether Dalton picked up passengers the night of the fatal shooting spree.
"We're looking into his connection to Uber and whether or not he was picking up fares in between the shootings," said Public Safety Chief Jeff Hadley.
"We are horrified and heartbroken at the senseless violence in Kalamazoo, Michigan. Our hearts and prayers are with the families of the victims of this devastating crime and those recovering from injuries," Uber's Chief Security Officer Joe Sullivan said in a statement.
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Kalamazoo County Undersheriff Paul Matyas told CNN eight people were shot in three locations. Authorities say the first shooting occurred around 6 p.m. in an apartment parking lot. Police say a woman was shot several times. She is currently listed in serious condition at the hospital.
Hours later, police responded to a shooting at a car dealership. Authorities say two people were shot and killed. The third shooting occurred in the parking lot of a Cracker Barrel restaurant. Police say four people in two separate cars were killed.
Kalamazoo County, Michigan, county prosecutor Jeff Getting said the 14-year-old girl shot at the Cracker Barrel was not killed, as previously reported, but "gravely injured."
Authorities recovered a weapon from the suspect's car. The names of the victims have not been released. A motive for the shooting is not yet known.
Uber said it has reached out to police to assist in the investigation.
CNN Wires contributed to this report.