building rocked central Philadelphia on Thursday, leading to evacuation of about 5,000 workers but causing no injuries, officials said.
Philadelphia reported the underground explosions, said Lisa Rotolo, a spokeswoman for the Philadelphia police.
parts of the surrounding area had been sealed off by police.
She said the cause was not immediately known.
known.
"We are not exactly sure how that fire was caused," the spokesman said in an interview on KYW radio.
was contained and primary electrical lines were unaffected.
caused the explosion. CNN quoted the FBI as saying there was no apparent link to an extremist attack.
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