Five killed after vehicle overturns

(ATTN: ADDS photo, more details)
MUJU, South Korea, Aug. 7 (Yonhap) -- Five university students were killed with as many injured Sunday when their van overturned near a tunnel in this southern county, police said.
The five students from Chungnam National University died after their vehicle slammed into a guardrail on a road in Muju, about 240 kilometers south of Seoul, at around 1:10 p.m., a local police spokesman said, adding they had rented the van for a retreat.
Three of the five surviving students sustained serious injuries and are being treated at Chungnam National University Hospital in Daejeon, north of Muju.
The van was bound for Daejeon when it hit the guardrail on a curvy, downhill section and rolled about two meters into the woods nearby, the police said. They added most of the students were not wearing their seatbelts.
One survivor said it all happened quickly.
"I felt we were speeding a bit," the surviving student said. "And all of a sudden, there was a bang and the car flipped upside down."
The police said they're still trying to determine the cause of the accident.