In his monthly meeting with the press, Mr Blair said that the government was examining the number of British soldiers in Iraq to see if more were needed.
But he also insisted that reviews like this happened all the time, and that it was nothing to be worried about.
There have been several bombings in Iraq, aimed at oil and water pipes, and some which have killed innocent Iraqis as well as foreign soldiers and aid-workers.
Mr Blair admitted that there was a "serious situation" in Iraq, but told journalists that most normal Iraqis were not against the US led forces.
He said "This is the British and American forces and the vast majority of Iraqis versus a small number of Saddam's supporters and an increasing number of outside terrorist groups."