The students had run away from the school to board the train to Haryana from Tinsukia Railway junction. They arrived at Panipat railway station in their home state on Wednesday.
Though no peripheral burning is taking place at the moment at the well's site at Baghjan, the company has declared an area up to 1.5 km radius as "red zone" to avoid any untoward incident and harm to the general public.
The blaze at the Oil India Ltd's oil well is so massive that it can be seen from a distance of more than two kilometres, eyewitnesses said.
The vehicle was carrying cash in new currency notes for wage payment to employees of a tea garden.