LONDON - British police are investigating a report of a suspicious item detected during a baggage check at London's Heathrow airport, which led to one of its terminals being briefly closed. 'We are working with Heathrow Terminal 3 after a report of a suspicious item detected by an X-ray of luggage,' London's Metropolitan Police said in a statement. Heathrow is one of the world's busiest airports and the affected terminal mainly services long-haul flights, although it also offers some European destinations.