Iraqi police say at least 22 people were killed and many injured Monday as two separate bomb attacks tore through crowded markets near Baghdad.
Fifteen people were killed at a marketplace in Hilla, to the south of the city, and later at least seven others died when a bomb exploded in Baquba, northeast of Baghdad.
Elsewhere, U.S. military officials said an American soldier was killed in an attack on Monday.
In Moscow, Russia's foreign ministry confirmed the deaths of four embassy workers taken hostage in the Iraqi capital earlier this month.
In a statement, Russian officials called on Iraq's government and multi-national forces to bring the perpetrators to justice. On Monday, the United States expressed its condolences to the families of the victims and to the Russian people.
An Internet video was posted Sunday showing masked men shooting one of the Russian diplomats and beheading another.
An al-Qaida-linked insurgent group the Mujahedeen Shura Council said it killed the four men to avenge alleged abuses by Russia's government.
The four were abducted earlier this month in an attack that killed a fifth Russian embassy worker.