DES MOINES, Iowa (AP) — A teenager accused of killing two clerks at different convenience stores in northern Iowa had previous run-ins with police in his suburban Minneapolis hometown and was on probation for theft.

Michael Richard Swanson, a 17-year-old from St. Louis Park was charged Tuesday as an adult with two counts each of first-degree murder and first-degree robbery in slayings in Kossuth and Humboldt counties.

Authorities accuse Swanson of walking into two convenience stores Monday night wearing a ski mask, demanding cash and in one case cigarettes. They say he shot the clerks even after they complied with his demands.

Authorities have not said why Swanson was in Iowa. Carolyn Marinan, a spokeswoman for Hennepin County, said probation officials received a call Monday from police in Swanson’s hometown of St. Louis Park saying he was missing, along with a vehicle from his home.

Swanson has just been released from the Hennepin County Home School after serving more than 100 days for a felony motor vehicle theft charge to which he pleaded guilty in July, Marinan said. As part of his release, he was put on probation for two years.

Information about that case is public because the charge was a felony, though other details about Swanson’s record aren’t public because of his age, Hennepin County Attorney’s Office spokesman Santo Cruz said.

Police confirmed they have had contact with Swanson in the past but said they cannot release details because he was a juvenile. Police records show previous calls to Swanson’s home, including five times this year, but it’s unclear who was the subject of the calls. One call in June was for “shots” and a call in July involved an assault.

Swanson was being held in Kossuth County on $1 million cash bond. The state Public Defender’s office, which was assigned to the case, declined to comment.

Prosecutors allege Swanson shot 47-year-old Vicky Bowman-Hall at the Crossroads Gas Station on U.S. Highway 18 in Algona around 9 p.m. Monday. About an hour later, Swanson walked into a Kum & Go convenience store in Humboldt, about 30 miles south of Algona and shot and killed Sheila Myers, 61, Kossuth County Attorney Todd Holmes said during a news conference in Algona.

Holmes said no link was found between the stores. He declined to disclose some details about the shootings, including whether others were in the stores at the time.

Related stories

17-year-old was on probation, records state
Minnesota teen allegedly admits robbing, killing store clerks
Suspect identified in shootings
2 dead in convenience store shootings in Algona, Humboldt