Chandigarh: At least four people, including two firemen, were trapped under debris after a building collapsed in Chandigarh's commercial hub of Sector 17 Sunday night, police said. It is feared that the trapped people may have died.

The building, which housed the government-run National Institute of Electronics and Information Technology (NIEIT) had caught fire Sunday evening after a blast in the air-conditioning unit that was being repaired. Rescue officials at the site said that efforts were being made to locate the trapped people.