"A team from our company will visit the accident spot to gather facts. We will offer full cooperation to the authorities and agencies investigating the mishap," Volvo's Indian subsidiary said in a statement here.
The luxury coach, built by the city-based subsidiary, was being operated by leading private transport carrier Jabbar Travels from Bangalore to Hyderabad, about 600 km away, through National Highway 7.
The accident took place involving a Volvo intercity coach at Kothakota in Mahabubnagar district, about 130 km from Hyderabad.
"At this juncture, we are not in a position to represent the sequence or cause of the incident as investigation is being carried by the authorities concerned," the statement added.
Volvo's air-conditioned buses are one of the popular modes of inter-city and intra-city transport services across the country.
"I have directed the Raichur deputy commissioner to help the victims' relatives to transport their bodies to Bangalore and offered to provide relief to them," Siddaramaiah said in a statement.
Raichur, about 500 km from Bangalore, is the border district across Mahabubnagar in the northern region of the state.
Heart-rending scenes were witnessed at the homes of some of the victims here as nearly 30 of the passengers boarded the bus late on Tuesday from the transport firm's office in the city centre.
One of the victims, Venkatesh Yadav, was president of the Chiranjeevi Fans' Association in Bangalore, formed by ardent admirers of former Telugu mega star and union tourism minister.
Yadav was travelling to Hyderabad with his sister Anita, who too perished in the bus fire.