Info from Various Sites says the flight was AAL78 767-300, passenger was reportedly emotionally disturbed and calmed by flight attendants. The captain, as a precaution, requested a priority approach to LHR as a result of the attempted flight deck entry and the lady's mental state but he advised that the situation was under control and no further assistance was required other than for police to meet the aircraft on arrival as is routine for any disruptive passenger.
The two RAF Typhoons broke off over Oxfordshire and returned to their Coningsby base.
Does the below say it basically happened in Irish Airspace??
http://avherald.com/h?article=4280c874&opt=0Incident: American B763 over Atlantic on Mar 2nd 2010, unruly passenger creates suspicion of unlawful interference
By Simon Hradecky, created Tuesday, Mar 2nd 2010 14:04Z, last updated Tuesday, Mar 2nd 2010 14:05Z
An American Airlines Boeing 767-300, registration N376AN performing flight AA-78 from Dallas Ft. Worth,TX (USA) to London Heathrow,EN (UK) with 161 passengers and 12 crew, was enroute over the Atlantic having passed N54 W30 at FL330, when the crew reported an unruly passenger trying to gain access to the cockpit and requested law enforcement to be present for landing in Heathrow. The airplane descended to FL250 and flew across Ireland and the UK at that level accompanied by two Royal Air Force fighter jets and continued for a safe landing in Heathrow. The passenger was taken into custody by UK police.
American Airlines reported, that a female passenger became distressed during the flight and attempted to gain access to the cockpit. The passenger was calmed by cabin crew, the flight crew requested a priority landing as a precaution. The airplane was met by police upon arrival.