One person was killed and four others seriously injured Saturday when a pickup truck carrying 12 people crashed and burst into flames just after midnight north of Makua Cave.

The 18-year-old driver fled the scene but later turned himself in and was arrested on suspicion of negligent homicide, failure to render aid and outstanding warrants, police Lt. Robert Towne said.

The crash was reported at 12:04 a.m. Towne said 12 people were in the truck: three in the front seat, four in the rear seat of the crew cab and five in the truck bed.

Police said witnesses reported that the truck was traveling very erratically toward Kaena Point State Park before the crash.

Police said the truck was weaving and speeding as it traveled north on Farrington Highway. It went off the road, hit a concrete piling and burst into flames about a half-mile north of Makua Cave.

Paramedics took three girls, ages 13, 14 and 15, and one boy, age 16, to a hospital in serious condition. Other occupants, including the driver, left the scene, police said. The driver turned himself in at the main police station about 11:40 a.m., police said.

After firefighters put out the flames, the body of a male victim was discovered in the front seat of the burned truck, a Fire Department spokesman said.

Traffic investigators did not immediately determine the identity of the victim. It was not immediately known whether alcohol or drugs were factors in the crash.

Police closed the highway in both directions for four hours while officers conducted an investigation.

The victim was the 33rd traffic fatality on Oahu this year, compared with 27 at the same time last year.