Irish republican dissident groups are targeting the British Conservative party conference this year, raising fears of a repeat of the 1984 Brighton attack that nearly killed the then Prime Minister, Margaret Thatcher.
Sources in Northern Ireland said the October conference in central Birmingham had emerged as the prize target on a hit list drawn up by resurgent republican paramilitaries.
Patrick Mercer, ex-chairman of the House of Commons subcommittee on counter-terrorism, said former senior police and Army intelligence officers had informed him that dissident splinter groups had discussed targeting David Cameron's first conference as British Prime Minister.
He said: "They want to kill by the end of August in order to get themselves poised for whatever operations they can mount in September leading up to the Tory [Conservative] party conference in early October.
"There are doubts over whether they have the capability, but the aspiration is certainly there and West Midlands police would be crazy not to take the threat seriously."
The West Midlands force confirmed it was aware of increased activity by dissident republicans and said its counter-terrorism unit was constantly assessing the threat before the Conservative Party conference.
Owen Paterson, the Northern Ireland Secretary, said the Government was monitoring the situation and insisted there was now unprecedented co-ordination between the security services and police responsible for tracking those responsible. "We have made a substantial number of arrests and we are bearing down on them," he said. "But we do not underestimate the threat they represent."
Laurence Robertson, the Conservative chairman of the Northern Ireland affairs select committee, said suggestions that dissidents could target the mainland were extremely worrying.
"So far it has been contained to the province but whether it is there or on the mainland it is very worrying. We hope it is not yet another chapter but it could be and it has to be dealt with."
Robertson said his committee would question Paterson about the threat level and co-ordination between police and the intelligence services when it met on September 8.
Mercer, whose Army career included nine tours in Northern Ireland, said his police and Army contacts had strong intelligence on republican dissident activity and he was sceptical whether the groups would be able to mount a spectacular mainland strike.
Police have already briefed businesses in the vicinity of the conference, to be held in the city's Hyatt Regency hotel from October 3 to 6. It will be the first held while the Tories were in Government since 1996.
Over the past 18 months, a series of incidents have alerted security forces to a growing threat from republican splinter groups. A week ago three girls were injured in Lurgan, County Armagh, when a bomb placed in a rubbish bin exploded.
Experts believe that veteran bomb-makers from the Provisional IRA are helping splinter groups to carry out the recent wave of attacks in Northern Ireland.
POLITICAL TARGETS
* The Provisional IRA came close to killing several Cabinet ministers when they bombed the Grand Hotel in Brighton in October 1984.
* The blast devastated the Conservative Party conference venue killing five people, including Conservative MP Sir Anthony Berry.
* The PIRA last bombed mainland Britain in 1996, targeting the London Docklands and later devastating Manchester city centre.
- OBSERVER
Tory conference 'top of Irish terrorists' hit list'
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