Nobody was injured in the blaze at the depot where around 125 low floor AC and non-AC buses were parked. The cause of the fire, which was reported at 3:20 AM, was yet to be ascertained.
DTC has appointed a three-member panel to investigate the cause of the fire and asked it to file its report within three days.
"Somebody might have lit a bonfire to keep warm during the winter night and left it unattended. These are CNG buses and a leak of the inflammable gas may have caught fire.
"Parked buses cannot catch fire on their own. It could also be some sort of sabotage but its too early to say and only forensic examination can reveal the exact cause of fire," Sharma told PTI.
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He said a total of 11 fire tenders were pressed into service and the fire was doused by around 5:15 AM.
"We have appointed a three-member fact finding committee, headed by Deputy Chief General Manager (Mechanical), which has been asked to submit its report within three days," DTC's Chairman-cum-Managing Director Debashree Mukherjee said.
The fire, however, did not engulf a CNG filling station which was close to the parked buses.
The police have registered an FIR and a forensic team visited the spot and picked up circumstantial evidence to ascertain cause of the fire. Depot officials and eyewitnesses were also questioned in this connection.