PORTLAND, Maine (AP) — A 74-year-old Maine man was charged in the shooting deaths of two tenants inside an apartment he rented out at his home, possibly over a dispute about where they parked their cars during a snowstorm, state police said Sunday.

James Pak was arrested at about 10 p.m. Saturday following a standoff at his suburban neighborhood home in Biddeford, about 15 miles south of Portland, police said. He is charged with two counts of murder in the deaths of Derrick Thompson, 19, and Thompson’s girlfriend, 18-year-old Alivia Welch.

Thompson’s mother, Susan Johnson, 44, called police to report the shootings at about 7 p.m. She and her 6-year-old son also live in the apartment, which is attached to the main house where Pak lived.