At least 15 persons were injured, five of them seriously, when the bus they were travelling in plunged into a 25-feet deep gorge at Wagobha Khind in Palghar district of Maharashtra on Mumbai-Ahmedabad highway early on Friday, police said.

The incident occurred around 6 am when the Maharashtra State Road Transport Corporation (MSRTC) bus was travelling from Bhusawal in north Maharashtra`s Jalgaon district to Boisar in Palghar, a police official said.