British fighter jets escorted a Pakistan International Airlines passenger plane to Stansted Airport near London on Friday, where police went on board and arrested two men on suspicion of endangering an aircraft.

Passengers were leaving the plane and no one was hurt in the incident, a spokesman for the airport said.

Flight PK709 from Lahore in Pakistan had been due to land at Manchester in northern England with 297 passengers on board, but was diverted shortly before arrival.

Britain is on high alert after a soldier was hacked to death on a London street on Wednesday in what the government are treating as a terrorist incident.

A security source said early indications were that the plane was not the target of a terrorist attack.
 
A passenger who had just got off the plane told the BBC the pilot had informed passengers after landing that he had diverted to Stansted because of threats. The passenger, named by the BBC as Munsif, said two men had been handcuffed on board and removed.

"We landed safely and then he announced that they had some kind of threat from someone and that's why he landed the plane," the passenger said, speaking by telephone.

"Essex Police have boarded a passenger plane diverted to Stansted Airport and two men have been arrested on suspicion of endangerment of an aircraft. They have been removed from the plane," the police said in a statement. The force is responsible for the area where Stansted is located.

"The two men arrested on suspicion of endangerment of an aircraft are aged 30 and 41. They are being taken to a police station for interview by detectives," the police added.

Stansted is one of London's less busy airports, preferred as a location for handling airplane security incidents. A spokesman for the airport said the plane was being held in an isolated area and that the rest of the airport was operating as normal.-Reuters