No fewer than three person died and four reportedly  missing when a tourist bus lost control after being hit by a stone and rolled off a mountain on Thursday in southwest China’s Sichuan Province.

The accident happened around 2.05 in the county of Songpan in Aba Tibetan and Qiang Autonomous Prefecture.

The bus, carrying 30 people, slipped to the roadside grass after being hit.

So far, three people have been killed, with 18 injured.

Four are missing, according to the county government.

The injured persons have been taking to the hospital and rescue is underway.