In Iraq, insurgents have attacked a U.S. combat outpost, killing two soldiers and wounding 17 others.
The U.S. military says the coordinated assault began when a suicide bomber exploded a vehicle outside the base, north of Baghdad.
Meanwhile, attacks in and around Baghdad Monday killed more than 25 Iraqis.
In the capital, at least 11 people were killed in a mortar attack on a mainly Shi'ite district (Dora). Police say five people died when a bomb exploded on a bus heading to another mainly Shi'ite district (Karradah). Roadside bombs in another Shi'ite district (Zafraniyah) killed at least six people.
Outside the capital, a car bomb killed four people in Duluiyah, north of Baghdad, while another car bomb killed one person in Mahmoudiyah, to the south.
The U.S. military says since Saturday three Marines and an Army soldier were killed while conducting combat operations in western Iraq.
Also on Sunday, car bomb attacks in mainly Shi'ite areas of Baghdad killed at least 60 people and wounding about 100.