Gov. Rick Snyder speaks Sunday at Bronson Methodist Hospital about the random shootings in Kalamazoo, Mich. Jason Dalton was arrested and charged.

KALAMAZOO, Mich. — Authorities trying to piece together an hours-long weekend rampage that left six people dead in western Michigan said they are looking into a report the suspect picked up at least one fare for a ride-hailing service between shootings.

Jason Dalton, a 45-year-old Uber driver and former insurance adjuster who police said had no criminal record, was arrested in connection with the shootings after a massive manhunt and was expected to be arraigned today. Authorities did not provide a motive for what they said was his targeting of victims with no apparent connection to him or to each other in the Saturday night shootings.

“How do you go and tell the families of these victims that they weren’t targeted for any reason other than they were there to be a target?” Kalamazoo County Prosecutor Jeff Getting said at a Sunday news conference.

Kalamazoo County Undersheriff Paul Matyas described a terrifying series of attacks that began about 6 p.m. Saturday outside the Meadows apartment complex on the eastern edge of Kalamazoo County, where a woman was shot multiple times. She was expected to survive.

A little more than four hours later and 15 miles away, a father and his 17-year-old son were fatally shot while looking at cars at a car dealership.

Fifteen minutes after that, five people were gunned down in the parking lot of a Cracker Barrel restaurant, Matyas said. Four of them died.

“These are random murders,” Matyas said.

Dalton was arrested without incident about 12:40 a.m. Sunday after a deputy spotted his vehicle driving through downtown Kalamazoo after leaving a bar parking lot, authorities said.

Matyas declined to disclose anything found in the vehicle except for a semi-automatic handgun.

By midday, authorities were investigating a Facebook post that indicated the suspect was driving for Uber during the manhunt and had taken at least one fare, Getting said.

A spokesman for Uber confirmed that Dalton was a driver for the company, but she declined to say whether he was driving Saturday night.