OHP says the crash occurred at the Sapulpa exit near Kellyville, causing traffic to be backed up for miles. OHP Lt. Mark Southall tells KRMG that a semi truck was parked on the outside shoulder when a truck pulling a trailer drifted off the roadway and hit the back of the semi. Both vehicles caught fire, and Southall says this is a fatality crash, but they aren't sure how many people have died. Two horses were removed from the trailer and one may have died. The semi driver was injured with non-life-threatening injuries.