NANCHANG, June 12 -- Six people died Sunday when a heavy truck flipped over and crushed a mini-van on an expressway in east China's Jiangxi Province, according to police.

Six passengers in the mini-van died at the scene of the accident, which happened around 9:50 a.m. at an expressway section in Huichang County in the city of Ganzhou, said a police officer with the county public security department.

The truck driver is in police custody. The investigation continues.