A crash about 15 miles south of Wheatland has blocked traffic heading southbound on Interstate 25.

Wyoming Highway Patrol Sgt. Kyle McKay says there was a single-vehicle rollover in the southbound lane at 12:37 p.m.

McKay didn't know how many people were in the vehicle or the extent of their injuries.

All southbound lanes are closed at milepost 71 and drivers should expect delays.