media. i love the van. reporter: but there were reportedly some problems between the two during the trip. a witness dialing 911, saying he saw a domestic dispute between laundrie and petito. we drove by, and the gentleman was slapping the girl. slapping her? yes. then we stopped. they ran up and down the sidewalk. he proceeded to hit her. hopped in the car, and they drove off. reporter: this call sending police to pull petito and laundrie over on august 12th. responding officers writing in their report that it was petito that was slapping laundrie, and concluding the situation was more likely a mental health crisis than a domestic assault. he wouldn t let me in the car before. reporter: that van could also provide some insight on just what happened to petito. investigators executing a search warrant last week, finding a hard drive inside the vehicle they say may contain viable