Rescuers search for victims in Doi Saket district, Chiang Mai, North Thailand, after a tourist coach swerved off the road killing at least 11 tourists on Dec 20, 2015. [Photo/CCTV News]

A tour bus carrying 25 people crashed in northern Thailand's Chiang Mai Province on Sunday morning, killing 13 people, including 12 Malaysian tourists and one Thai tour guide, the Chinese Consulate General in Chiang Mai said.

Twelve others were injured in the accident, including 10 Malaysian tourists, a Malaysian tour guide and a Thai driver, the consulate general said.

There are no Chinese casualties as reported by local media earlier.

The injured have been rushed to the hospital, it added. Police are investigating the cause of the accident.

At around 11:30 a.m. local time, the bus reportedly crashed into a roadside pit while heading from Chiang Rai province to Chiang Mai.