At least six people have been killed and 25 others injured in two car bomb blasts in north-eastern Baghdad.
Iraqi security forces are regular targets for insurgents
The suicide attacks struck a mosque and a police station in the mainly Shia Shaab district of the capital.
Earlier, at least five Iraqi policemen were killed and nine others wounded by a suicide bomb attack near the Iraqi city of Baquba, security sources said.
The attacks came as US and Iraqi forces announced they had secured the town of Husayba on the Syrian border.
Some 3,500 troops have taken part in Operation Steel Curtain targeting insurgents along the Euphrates valley.
The aim of the operation was to seal off a main route for foreign fighters entering western Iraq.
Col Stephen Davis, a US Marine commander in Husayba, said in a statement that "clearing operations" had ended and that the US-led forces had now established a permanent security presence.
"Patrols and targeted raids are also being conducted to root out any remaining al-Qaeda and Iraq-led insurgents," the statement added.
One US Marine and 36 insurgents were killed in the offensive launched on Saturday. Over 180 suspected militants were arrested.
In the attack on the outskirts of Baquba, the police patrol was hit by a car bomber as it entered Tawila, 65km (40 miles) north of the capital Baghdad.
In other violence on Wednesday, an employee of the Sudanese embassy in Iraq was shot dead after unidentified gunmen opened fire at his car in the west of Baghdad.