A former army chief has said Britain must start an aggressive bombing campaign in Syria if we are to have any chance of defeating IS.
Colonel Richard Kemp told ITV News a large ground operation was needed as well as airstrikes.
He said: "These are savage people. They will stop at nothing.They have no principles, they have no qualms as far was the laws of war are concerned.
"I'm not saying we should throw out the laws of war but we have to be hard with them.
"We cannot afford to be soft and pussyfoot as we have done sometimes in other conflicts."
David Cameron wants to stage a parliamentary vote on British military action against IS in Syria this week.
But Defence Secretary Michael Fallon said as yet Cameron did not have the support of enough MPs to guarantee victory.
As things stand it is uncertain how many Labour MPs will back him.
Jeremy Corbyn, who is opposed to the government's policy of extending airstrikes, said no decision had been made yet to allow a free vote.
This weekend there have been protests around the country against going to war with Syria.
Thousands marched on Downing Street to vote down plans to bomb the war-torn country.
They were joined by actor Mark Rylance and former MP and anti-war protester George Galloway.
