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Heathrow Airport said it was "fully operational" on Saturday, after an almost daylong closure sparked by an electrical substation fire. But airlines warned that severe disruption will last for days.
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The airport restarted full operations on Saturday, after a power substation fire halted operations for most of Friday.
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There was no indication of foul play, authorities said, but they were not ruling it out. Counterterrorism investigators were dispatched.
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