UPDATE 1:18 p.m.
Troopers on the scene said I-35 north bound at the 42 mile marker has been opened. The roadway remains closed at exit 40 on the south bound side. Southbound traffic is being diverted at exit 40 currently.
Oklahoma Highway Patrol Trooper Walter Jack said I-35 north bound and south bound is closed between the 40 and 42 mile markers for a collision with at least one fatality. Traffic is being diverted at exit 40 north bound and at exit 42 south bound. Several Troopers are on scene at this time.