A tourist bus carrying 25 passengers plunged off a roadside pit in northern Thailand’s Chian Mai province Sunday morning, killing 13 people, Xinhua News reported, citing the Chinese Consulate General in Chiang Mai. Twelve deceased were Malaysian nationals and one Thai tour guide, the consulate general said, adding that there were no Chinese casualties.

The accident occurred about 11:30 a.m. local time (11:30 p.m. EST Saturday), Xinhua reported, adding that police are determining the cause of the crash. Those injured were taken to local hospital.

Photos of the accident posted on social media showed a completely destroyed bus overturned in a pit.

Fatal road accidents have been common occurrence in Thailand. In October, World Health Organization (WHO) stated in a report that Thailand had the world's second most dangerous roads with 36.2 fatalities per 100,000 people. According to WHO, the official number of road deaths in Thailand for 2012 was 14,059.