According to an official release, Gogoi asked the Secretary of the Transport Department to inquire the accident.
The Chief Minister also expressed his condolence and wished speedy recovery of the injured.
During early hours today, nine persons, including five women, were killed and 24 other passengers were injured when the bus they were travelling in fell into a roadside ditch at Uluani in Nagaon district.
The incident occurred when the bus ferrying passengers from Lakhimpur district to Guwahati for a train journey to Delhi hit the railing of a small bridge before rolling down into a ditch at around 1.30 AM.