
Thousands of passengers were evacuated after officers moved in on the British suspect, aged in his 30s.
Flyers had to wait outside for around 90 minutes before they were allowed back into the largest terminal at the airport which is used exclusively by British Airways.
Security workers are believed to have become suspicious when he walked into the building carrying a suitcase this afternoon.
Officers only evacuated people from the check-in area who had not been through passport control.
Police cordoned off a small area while they dealt with the incident.
Around 70,000 passengers go through Terminal 5 each day and up to 5,000 passengers are thought to have been disrupted.
A spokesman for BAA said that no flights had to be cancelled.
'The Terminal 5 departures concourse has now been re-opened following an earlier police incident,' he said.
'We are sorry for the inconvenience caused to passengers while police attended this incident.'
He advised passengers to leave extra time to travel to the airport for the rest of the day because the airport had been 'very busy' as a result of the disruption.
A spokesman for the Metropolitan Police said: 'A suspect package was found at Terminal Five this afternoon and someone was with police.
'They were not arrested and the incident has been cleared.



"Security workers are believed to have become suspicious when he walked into the building carrying a suitcase this afternoon."
Don't all passengers walk into the check in area of an airport carrying a suitcase?
This is the second evacuation at Terminal 5 in a week. Either a very credible threat been made that the security services and police are not telling the public about or we are being conditioned for another false flag. Nothing like another 9/11 to distract the public from economic collapse.