Passengers from a delayed Ryanair flight flying from Madrid to the Manchester airport were able to enter the UK without having their passports checked.
The incident took place early on Saturday when the Flight FR3186 that was scheduled to arrive at 23:35 BST on Friday, arrived at 02:05 BST on Saturday morning.
Video footages from mobile phones showed passengers from the plane crossing the passport control desks that seemed to be empty.
Authorities at Manchester airport have launched an investigation into the matter.
A Manchester airport spokesperson was quoted by the Manchester Evening News as saying: "It is the responsibility of an airline's handling agent to notify UK Border Force about arrivals from outside of the UK. By them doing this in advance of a flight's arrival ensures the relevant UKBF staff is in place to handle the immigration process.
"As an airport we will work closely with our third party partners to investigate what occurred in this instance."
Between 130 and 140 passengers were said to be on board who had disembarked at Terminal 3 of the airport.
Ryanair later released a statement that blamed a failure in Manchester airport's computer systems for the incident.
"There appears to have been a malfunction in the airport's system, which caused incorrect flight information to be published, and subsequently resulted in this issue at border control.
"We have asked Manchester Airport to look into this matter and ensure it does not recur."
Image: Manchester airport experienced a security breach when passengers from a flight disembarked at Terminal 3 and entered the UK without a passport check. Photo: courtesy of GeographBot.