A father and his 4-year-old son drowned over the weekend when their kayak overturned on a northern Minnesota lake, authorities said.

Hubbard County Sheriff's Office deputies were called to Hart Lake, about 20 miles southeast of Bemidji, around 1:25 p.m. Saturday on a report that a kayak had overturned and that two people did not surface.

Rescue workers spotted the upside down kayak and began a search. They found the boy and administered CPR before he was flown to the University of Minnesota Hospital in critical condition. He died Sunday night after being taken off life support, said Hubbard County Sheriff Cory Aukes.

Searchers from several agencies continued looking for the boy's father, identified by the Sheriff's Office as Jesse Anderson, 42, of Northwood, Iowa. Boats, divers and a helicopter were used, but he was not found. They suspended the search Saturday because of darkness and adverse weather conditions, Aukes said. Anderson was found in about 6 feet of water shortly before 11 a.m. on Sunday.

Neither Anderson nor his son was wearing life jackets, Aukes said.

Tim Harlow