MANDAN, N.D. — Authorities are searching the Heart River west of Mandan for a 75-year-old Bismarck man whose boat was found capsized.

The man’s wife alerted authorities Monday evening after being unable to contact him. His boat was later found capsized and caught in an ice jam. His name wasn’t immediately released.

Searches have been conducted on the ground, from the air and with an underwater remote-operated vehicle. Dive teams have been standing by.