A handful of pro-fox hunting campaigners broke into the House Of Commons chamber this afternoon ahead of a crucial vote on the issue.
The five protestors, wearing white T-shirts remonstrated with MPs causing the debate on the issue to be suspended temporarily.
A security source said up to 10 protesters had burst into a corridor behind the Speakers' chair, however security staff were able to apprehend a number of the men before they entered
the chamber.
It is the second major breach of security in Britain in less than two days.
Meanwhile outside the House Of Commons, police and protestors clashed violently in central London.
Police used battons on protesters as they surged towards police lines. Television footage showed several protesters and police officers were injured.
Fox hunting could be outlawed across Britain after hundreds of years as parliament votes this evening to ban it against a backdrop of street protests and political wrangling.
The ancient countryside pursuit has long inflamed passions, denounced as a barbaric bloodsport by its opponents but defended as an essential part of rural life by its supporters.
British Prime Minister Tony Blair's government pledged to outlaw hunting with dogs when it took power in 1997 but fierce opposition has repeatedly stalled legislation.
Mr Blair is now determined to push through a ban before an expected general election next year. The move should placate Labour MPs, who overwhelmingly support banning a pastime many see as an elitist relic of feudal times.
The Commons is expected to vote on the bill late tonight but it must then return to the House of Lords. The government is threatening this time to use the Parliament Act, a device to overrule Lords' opposition and force a bill into law.
As an olive branch to the pro-hunt lobby, the government is offering to delay the implementation of a ban until July 2006.