A bus carrying young students with their teachers caught fire in suburban Bangkok on Tuesday with 25 of those on board feared dead, according to officials and rescuers.

The bus was carrying 44 passengers from central Uthai Thani province to Bangkok for a school trip when the fire started around noon in Pathum Thani province, a northern suburb of the capital, Transport Minister Suriya Jungrungruengkit told reporters at the scene.

Interior Minister Anutin Charnvirakul said officials could not yet confirm the number of fatalities as they have not finished investigating the scene, but based on the number of survivors, he said 25 people are feared dead.

Videos posted on social media showed the entire bus being engulfed in fire with huge plumes of black smoke pouring out as it was parked on the road.

The age and other details about the students were not yet known.

A rescuer at the scene told Suriya that the fire likely started after one of the tires exploded and the vehicle scraped against a road barrier.

Rescue group Hongsakul Khlong Luang 21 posted on its Facebook page that they found at least 10 bodies on the bus.