Authorities in Iraq report at least 25 people were killed or found dead in attacks nationwide Monday.
Extremists struck again at Shiite pilgrims, killing four people in a roadside bombing. The bombing on the outskirts of Baghdad also wounded 15 people. Meanwhile, the death toll from a suicide attack targeting pilgrims yesterday rose to 56.
U.S. officials are blaming al-Qaida in Iraq for yesterday's bombing.
Iraqi security forces have been facing a series of deadly attacks in northern Iraq.
Police in Samarra say a suicide bomber sitting in a wheelchair talked his way into the city's operations center and detonated, killing the deputy commander.
Gunmen also opened fire on a police convoy, killing four officers, in the northwestern city of Mosul.
An Iraqi army patrol was targeted by gunmen in Diyala province. At least eight soldiers were killed.