This morning' s COBRA meeting, chaired by Mr Cameron, was attended by Home Secretary Theresa May, Defence Secretary Philip Hammond, Mayor Boris Johnson, Met Commissioner Sir Bernard Hogan-Howe, and Assistant Commissioner Cressida Dick.
The Minister for Faith and Communities Baroness Warsi, Communities Secretary Eric Pickles and the British intelligence agencies.
More top news
The Boeing 777 was reportedly intercepted by two Hungarian Air Force Gripens after it lost contact with air traffic controllers.
Culture Secretary is mulling over a bar on the broadcaster going head-to-head with commercial rivals as part of the review of its charter.
EastEnders stalwart Dame Barbara, 78, is leaving the soap and her final episodes as Peggy Mitchell will be shown in just over a week.