David Cameron is to set out a "comprehensive strategy" for dealing with Islamic State - including extending RAF air strikes into Syria.
The Prime Minister told the Commons that the terror attacks in Paris had strengthened the case for tackling IS - also referred to as Isil, Isis or Daesh - on its home ground.
He said that as an "important first step" he would be setting out the case for doing so in a personal response to the recent report by the Commons Foreign Affairs Committee.
"My firm conviction is that we need to act against Isil in Syria. There is a compelling case for doing so," he said.