Britons are being warned to be vigilant amid fears of revenge atrocities over Osama bin Laden's shock killing.
Security services were on high alert across the West after predictions of tit-for-tat bloodshed in the coming weeks. Al Qaida will "undoubtedly" recover and strike back in retaliation, experts said.
The Government urged caution over "inflammatory" warnings from extremists of another 7/7-style terror attack.
Defence Secretary Liam Fox has ordered British military bases to maintain a "high level of vigilance".
But Home Secretary Theresa May said the country's overall threat level from international terrorism remained unchanged at "severe". Ms May said: "There is a continuing need for everyone to remain vigilant and to report any suspicious activity to the police."
Associates and supporters of bin Laden said the killing will not see an end to al Qaida.
Domestic attacks and "more intense fighting" in Iraq and Afghanistan will be sparked within days, Anjem Choudary, the former UK leader of the outlawed al-Muhajiroun organisation, said. He said supporters in the UK loved bin Laden "the way they care about their own parents".
Noman Benotman, a former jihadist leader of the Libyan Islamic Fighting Group and an associate of bin Laden from 1989 to 2000, said Bin Laden's death is a "major blow" to al Qaida. But he added: "At an operational level, bin Laden's death may have no immediate effect on the group's activities."
John Gearson, reader in terrorism studies and director of the Centre for Defence Studies at King's College London, said embassies and military around the world will remain on high alert "for some time".
Frank Faulkner, a terrorism specialist at the University of Derby, said revenge attacks in the aftermath of bin Laden's death were on the horizon, adding: "It's just a case of when and where."