Britain’s Manchester Airport launched an urgent investigation yesterday after an 11-year-old boy managed to slip through security and fly to Rome without a passport or ticket.

Liam Corcoran walked through security checks without showing any documentation and successfully boarded a Jet2.com flight to the Italian capital on Tuesday, the airport in northwest England admitted.

“This is an unusual and serious breach and we are keen to find out what has gone on,” Transport Minister Justine Greening told the BBC.

Liam was scanned by security staff but they did not notice his lack of a passport and boarding pass as he mingled with a family boarding the plane, the Manchester Evening News reported.

Passengers noticed halfway through the flight that the boy was alone and alerted the cabin crew.

“This extremely serious matter is now being urgently investigated by officials from the airport and airline,” an airport spokesman said.

“It is clear that documentation has not been checked correctly at security and boarding gate. The boy went through full security screening so the safety of passengers and the aircraft was never compromised.”

Several staff from Manchester Airport and Jet2.com have been suspended while the investigation takes place.

An airport spokesman said Liam stayed on the plane after it landed in Fiumicino and returned on the same plane to Manchester, where he was met by his mother.