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LONDON, July 4 (Reuters) - London's Heathrow Airport said on Tuesday that its Terminal 3 building had been evacuated following a fire alarm, which was being investigated.
"T3 has been evacuated following a fire alarm. We are investigating this as a matter of urgency and will provide an update shortly," Heathrow Airport, which is Europe's largest airport, said on Twitter.
Reporting by Alistair Smout, editing by Andy Bruce