Fire investigators are searching for evidence to establish the cause of the fire, which broke out shortly before 1330 GMT.

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The police said an electrical fault was the likely cause for the fire in the Ashulia industrial zone.

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Caroline Lucas MP, Green Party leader, said she had written to the Ministry of Defence following the fire and called for an independent inquiry into the cause.

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Authorities said the cause of the fire was being investigated, but some protesters called for an independent investigation, it said.

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But for survivors like Sharon Simmons, the first explosion and fire, no matter the cause, was enough to send them running from WTC 2.

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If you asked my wife, she would say "yes" because for awhile, during that minute or so after the pop, she thought that the explosion and fire might cause a hole in the side of the plane that would decompress it.

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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.

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"We have concerns that a hospital has been partially damaged, a market has caught on fire, the airport was closed down for inspection because of the fear if they landed any planes, " it might cause problems, Ulrich said.

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