An Uber driver has been arrested after six people were killed in Kalamazoo, around 150 miles west of Detroit. The man allegedly picked up customers and successfully dropped them between shootings.

It was Jason Dalton, 45, who allegedly opened fire at random. Investigators are yet to find any motive behind the shootings. According to prosecutors, Dalton opened random fire at a car dealership, in parking lots outside an apartment building and at a Cracker Barrel restaurant in Kalamazoo.

Reuters reports that a teenage girl, who was believed to have been killed in the shootings, has been found to be wounded.

Kalamazoo shooting suspect Jason Dalton was Uber driver, took fares in between massacres #Cronaca #iNewsPhoto

Posted by INews Photo on Sunday, 21 February 2016

Uber has confirmed that Dalton was an Uber driver, who had passed a background check. “We are horrified and heartbroken at the senseless violence in Kalamazoo,” Uber’s chief security officer Joe Sullivan told CNN in a statement. “We have reached out to the police to help with their investigation in any way that we can.”

Prosecutors alleged that Jason Dalton, 45, opened fire, apparently at random, in parking lots outside an apartment building, a car dealership and at a Cracker Barrel restaurant in Kalamazoo, about 150 miles (240 km) west of Detroit.

The man was reportedly looking for passengers after carrying out the killing rampage for nearly seven hours. A man, who claims to have been a passenger in Danton’s car before the shooting started, said it all started after the Uber driver had got a phone call.

“We were driving through medians, driving through the lawn, speeding along and when we came to a stop, I jumped out the car and ran away,” Matt Mellen told WWMT. “We posted the picture on Facebook just so our friends wouldn’t get in the car with him if they had to take an Uber that night.”

According to Mellen, he talked to the police and tried contacting Uber. He said Dalton was “surprisingly calm.”