HOHHOT - Six people were killed after two vehicles collided in Northern China's Inner Mongolia, local authorities said Tuesday.

The accident occurred around 11 a.m. Monday, when a car in Huade county of Ulanqab city rear-ended a tractor. The tractor, driven by Zhang, 54, had six passengers. Zhang and five of the passengers were killed.

Three others were injured in the accident.

An investigation is underway.