Relatives of British IRA victims faced off in London over their view of the peace process outside an Irish republican event addressed by Sinn Fein leader Gerry Adams.
Police intervened to stop a verbal exchange between Colin Parry, whose 12-year-old son Tim was killed by an IRA bomb in Warrington 15 years ago, and campaigners for the 21 victims of the Birmingham pub bombings.
Brian Hambleton, whose 18-year-old sister Maxine was killed in the 1974 Birmingham attacks, accused Mr Parry of "rubbing shoulders" with the men who had killed his son in the Warrington attack.
The confrontation came after Mr Parry had delivered a speech at the conference organised by SF about the work he does with a peace foundation he created to honour his son and a three-year-old boy who was killed by the same blast.
After moving on at the police's request, he said: "They don't understand that we don't just yell about victims – we work with victims of terrorism, we actually help them.
"The idea that I am some kind of IRA apologist is disgraceful. . . It hurts that somebody would be so unaware of what we do that they could accuse me of kow-towing to terrorists.
"I don't do that and I never will, but I recognise that the armed struggle is over and we have to build new ways. That's my simple position."
About 30 protesters picketed the conference, held in the London Irish Centre in Camden, north London.
They carried banners which read 'Justice For The 21' and 'Gerry and The Peacemakers Will Always Walk Alone While IRA Victims Are Ignored'.
A group of far right-wingers carrying a loyalist flag confronted Sinn Fein members and sympathisers leaving the Irish centre and accused them of attending a "murderers' covenant".
After talking to Mr Parry, Mr Hambleton said: "He wants us all to jump on the Jolly Roger with him and Gerry Adams."
During a speech delivered earlier in the day, Mr Adams said he "understood" the grief of relatives of the Birmingham and Warrington killings.