HANGZHOU, April 28 -- Five people were killed and another 13 were injured after a bus rolled over on a highway in east China's Zhejiang Province, local authorities said on Monday.

The accident happened at 3:16 p.m. Sunday when a bus rolled over after colliding with a car at the Ningbo section of a highway linking the cities of Hangzhou and Ningbo.

Two passengers died at the scene, and three others died after emergency treatment failed. Thirteen injured people are in stable condition, authorities said.

All the passengers on the bus were staff from a local hotel. They were heading back to the city from a scenic spot when the accident happened.

The cause of the accident is under investigation.