Pilot Henry Richardson, 26, returned to his home in France to find armed offices and a bomb squad swarming around his modest flat.
He soon learned a suspected suicide vest had been found discarded in his bin by a street cleaner.
The location was close to where a mobile phone belonging to on-the-run terror suspect Salah Abdeslam was discovered, and authorities believe the vest may have belonged to him.
The device discovered at Mr Richardson”s home in Montrouge was similar to those used in the explosions outside the Stade de France during the terror attacks.
Mr Richardson, originally from Guernsey, was forced to wait outside with his partner, Emma Legault, for hours before he could get back into his home.
Mr Richardson said: “Everything was shut off and there were tons of police.
“We were shut out until about 9pm when they let us back in the building.
“Everyone is quite concerned and there are no crowds anywhere because of the state of emergency.
“There are not as many people on the streets, either.
“But if you were just visiting, you would not really know the difference.”
More than 130 people were killed during the attacks. One suspect, Abdeslam Salah, is still on the run.