Four people are dead and four injured following a head-on collision in Aptos last night. The incident occurred on Freedom Boulevard near Valencia Road shortly after 8 p.m. Officials say a Mercedes carrying six passengers was travelling westbound when it drove into on-coming traffic, crashing head-on into a pick-up truck. The driver and two passengers in the Mercedes were pronounced dead at the scene. A fourth passenger was pronounced dead at the hospital. Three additional passengers and the driver of the pick-up truck were transported to medical centers with major injuries. Officials say it appears alcohol or drugs were a factor in the collision and that no one in the Mercedes was wearing a seat belt. The incident is currently under investigation.