Three people were injured in a head-on collision Thursday morning on Highway 89 north of Paulden. DPS says the accident happened at around 4:22 a.m. and it involved a passenger vehicle and a pickup truck. The accident closed Highway 89 in both directions through the morning hours, but has reopened. Two of the three injured were taken to the hospital by ambulance, the third injured person was airlifted from the scene. The cause of the accident is under investigation.