At least six people were killed and around 21 injured after a bus rolled down a 250- feet deep gorge in Himachal Pradesh's Sirmaur District on Thursday.

The mishap occurred at around 6.30 pm at a place called Pajjhar (200 kilometres from Shimla) when a bus going from Solan to Chambi Dhar fell into a gorge.

The 21 injured have been shifted to a hospital in Solan, while five critically injured have been sent to PGI in Chandigarh.