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
After his arrest, Apopei described his girlfriend as "a witch" and paced around his cell ranting about devil worship.
Controversial police chief Cressida Dick was today named Scotland Yard's first woman Commissioner.
Police accidentally sent letters to seven people killed in the Croydon tram crash, inviting them to a survivors meeting.