The spokesman said an investigation has been launched to establish the exact cause of the fire.
The cause of the fire, which damaged the basement and first floor, is under investigation.
The cause of the fire is under investigation, but authorities believe lightning is to blame.
He added that a full investigation was under way to establish the cause of the fire.
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But the cause of the fire that crippled the Triumph is still under investigation.
Fire investigators are searching for evidence to establish the cause of the fire, which broke out shortly before 1330 GMT.
An investigation into the cause of the fire has begun but it is not thought to be suspicious.
Officials said investigators were "leaving no stone unturned in their efforts to establish the cause of the fire".
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Detectives are investigating but said the cause of the fire at Stroud School in Highwood Lane was not yet known.
No casualties were reported and the cause of the fire in West Street, reported at 11:20 GMT, is being investigated.
Authorities said the cause of the fire was being investigated, but some protesters called for an independent investigation, it said.
The expert said a degraded capacitor, a circuitry component used in various electrical appliances, was the likely cause of the fire.
The cause of the fire, which started shortly before 15:00 GMT, is believed to have been an electrical fault, firefighters said.
It could take up to a year to determine the cause of the fire, however, because of the amount of work involved.
An investigation is under way to determine the cause of the fire.
Japan Airlines confirmed the cause of the fire in a news release.
The cause of the fire, which happened in the workplace, is under investigation but is not thought to be the result of enemy action.
The NTSB, which is investigating the Boston incident, hasn't yet determined the root cause of the fire and may never be able to do so.
Investigators said the cause of the fire was not considered suspicious.
The cause of the fire is not yet known and a scaled-down presence was expected at the site for some time as damping down continued.
Harriet Harman, the area's MP, said there would have to be a thorough investigation into the cause of the fire and whether the prevention was adequate.
Det Supt Singh said the cause of the fire had not yet been established and a joint investigation by the police and fire service was continuing.
The westbound lanes of the bridge were closed as officers investigated the cause of the deadly fire, but the patrol said one lane of traffic reopened early Sunday.
West Bengal Chief Minister Mamata Banerjee said police and fire officials have been ordered to investigate the cause of the fire and submit their reports within three days.
Investigators have yet to release the cause of the fire.
BBC: Investigators have not yet disclosed the cause of the fire
The cause of the fire and explosion has not been determined yet, but investigators have isolated the center of the blast, Assistant State Fire Marshal Kelly Kistner said Sunday.
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