August 13, 2006
Possible links between the alleged plot to blow up transatlantic jets and the 7 July London bombings are being probed, sources have told the BBC.
Security correspondent Gordon Corera said officials also fear unconnected groups could be inspired to carry out their own attack.
Meanwhile Home Secretary John Reid said recent counter terrorism arrests did not mean the threat had ended.
Police continue to hold 23 people over the alleged liquid bomb plot.
Our correspondent said concern over the possibility of an attack meant it could be several weeks before officials felt confident enough to lower the threat alert level from "critical".
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http://news.bbc.co.uk/1/hi/uk/4787893.stm