George Galloway was accused last night by a senior minister of "dipping his poisonous tongue in a pool of blood" after the former Labour MP warned the terrorist attacks in the capital will not be the last.
The Respect Member for Bethnal Green and Bow and anti-war campaigner swiftly hit back at his accuser, Armed Forces Minister Adam Ingram, likening him to a "foul mouthed ... thug".
Deputy Speaker Sylvia Heal had to intervene, reminding the House that "good temper and moderation" were the hallmarks of language in the Commons and they should remember that on this day of all days.
The bitter spat in the dying moments of a defence debate came after MPs had earlier united in sorrow and condemnation of the terrorist attacks across London.
In the debate, Mr Galloway condemned the "despicable act" but warned the Iraq war and other actions had created a "whole army of people out there that want to harm us".
He accused MPs of living in a "consensual bubble" of denial and said unless action was taken, there would be repeats of the atrocity in the capital.
"There was nothing unpredictable about this attack. Despicable, yes, but not unpredictable. Entirely predictable and, I predict, not the last either" Mr Galloway said.
"Let there be no equivocation: the primary responsibility for the bloodshed this morning lies with those who carried out the acts.
"But it would be utterly crass to ... separate these acts from the political backdrop against which they took place.
"They did not come out of a clear blue sky, any more than those monstrous mosquitos that struck the twin towers and other buildings in the United States on September 11 2001."
"Does anyone doubt that 10,000 bin Ladens at least have been created by the events of the last two-andahalf years? If they do they have their heads in the sand," he added.
Tory frontbench spokesman Julian Lewis delivered a stinging rebuke to Mr Galloway at the close of the debate.
But Mr Ingram went further, accusing his former party colleague of "dipping his poisonous tongue in a pool of blood," adding: "I think it is disgraceful."
Mr Galloway responded: "That foul mouthed, deliberately timed last ten seconds smear by the thug at the despatch box ..."