- 19 updates
Stansted Airport said passengers were being taken off the Pakistan International Airlines plane.
A spokesperson said the passengers "will be taken to a reception centre on the airport where police may wish to interview them about what they have seen".
"At some point police and the airline will arrange for their onward transportation to Manchester", they added.
Essex Police said the two men arrested on suspicion of endangerment of an aircraft have been taken to a police station to be interviewed:
A relative of two PIA flight passengers said he spoke to his father on the phone after the plane landed at Stansted Airport.
Zohaib Sattar said his father Abdul told him there was "no warning or threat" before the flight was diverted.
Zohaib Sattar said: "They have taken two people off the plane and are checking the plane all over.
"The rest are just sat there waiting for further information.
"My father said there was no warning or threat, all of a sudden the plane just turned around".
A passenger told Pakistan's GEO TV that the two men arrested on board a Pakistan International Airlines plane had tried to move towards the cockpit during the flight.
Nauman Rizvi told the news channel that after the men were taken away by police, the flight crew told passengers there had been a terrorist threat and that the pilot had raised an alarm.
Another passenger, Umari Nauman, told Sky News, "The cabin crew informed us that basically they tried to come into the cockpit a few times, and because they had been asked not to do that they got into a bit of an argument with the crew and made a few threats".
Ms Nauman said all the passengers had been ordered to leave their possessions on board before leaving the plane.
She also said helicopters escorted the aircraft before landing.
Heathrow's chief operating officer Normand Boivin praised BA pilots for their quick, professional response to this morning's emergency landing.
The Ministry of Defence said two Typhoon fighter jets from RAF Coningsby escorted the Pakistan International Airlines flight to Stansted Airport.
Two RAF Typhoon jets are escorting a passenger plane from Pakistan to Stansted airport - the UK's designated counter terrorism airport.
The RAF has confirmed that one of its Typhoon jets was scrambled from RAF Coningsby in Lincolnshire in order to divert a passenger jet from Manchester Airport.
The Guardian reports that the pilot of the plane that has been diverted to Stansted Airport asked for this to happen because he was concerned about a disruptive passenger who had started shouting.
The pilot then became satisfied that the incident had been resolved, the newspaper reports.