According to one of the passengers, the aircraft's cabin crew said two men had repeatedly tried to get into the cockpit.
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."
She said all the passengers had been ordered to leave their possessions on board before leaving the plane.
Ms Nauman also said helicopters escorted the aircraft before landing.
More top news
A British Transport Police officer said his broken nail amounted to assault but failed to offer any evidence to explain how it happened.
Zac Goldsmith lost his Richmond Park seat in a shock defeat to the Liberal Democrats.
A woman has been jailed for over two years for crashing into a car and killing a man while trying to send a birthday message on Facebook.