US President George W Bush has given orders to confront those who target Iraqis or US forces in Iraq, as US and Iraqi officials confirmed tough new tactics targeting Iranian agents there.
'If somebody's trying to harm our troops, or stop us from achieving our goal, or killing innocent citizens in Iraq, we will stop them,' Mr Bush said.
He was meeting the new commander of US forces in Iraq, Army Lieutenant General David Petraeus.
Gen Petraeus was confirmed by the US Senate earlier to take command of the Iraq war.
In a reference to opposition in the US Congress to his new Iraq strategy, Mr Bush said those opposed should offer their own plan.
Pelosi visits Baghdad
In Baghdad, Nancy Pelosi, speaker of the House of Representatives, met Iraqi Prime Minister Nuri al-Maliki during an unannounced visit.
Mr Maliki assured Ms Pelosi of Iraq's intention to assume security missions currently handled by US-led forces in Iraq.
Ms Pelosi expressed support for the transfer of responsibility to Iraqi forces.
She said she did not oppose efforts by the administration to accelerate the transfer of all responsibilities.
19 killed in attacks
Iraqi insurgents killed 19 people and injured scores more today.
15 were killed when Baghdad's well known Al-Ghazil (Spinning) pet market was bombed. 35 were injured there.
In another suicide bomb attack, a bomber blew up his car as an Iraqi army patrol passed in the capital's mixed Allawi district, killing two people and wounding four more.
Elsewhere, one person was killed and three wounded when a bomber wearing an explosives belt blew himself up near a Shiite mosque in Mosul.
And in the town of Iskandiriyah, 40km south of Baghdad, a woman was killed when insurgents attacked a policeman's house.
