JEFFERSON, N.H. — Investigators say a New Hampshire state trooper nodded off at the wheel before running into two bicyclists along the road in Jefferson, N.H., this week.

Sgt. Todd Cohen was escorting a wide load on Route 115 on Thursday, when he drifted off the road and hit a father and son from Orono, Maine, from behind.

He had been leading the truck about 133 miles from the state line in Salem and was headed to Gorham.

Fifty-seven-year-old David Clement and his 25-year-old son, Timothy Clement, are in Dartmouth-Hitchcock Medical Center. The hospital said David Clement was in serious condition Friday. Timothy Clement was in satisfactory condition.