Iraqi authorities say two bomb explosions in Baghdad have killed at least 15 people near a Shi'ite mosque. Early reports say nearly 60 others were wounded.
Police say the second explosion came when a suicide bomber drove his car into a crowd gathered to help victims of the first blast.
Elsewhere Sunday, police say two suicide car bombers killed at least six people and wounded dozens outside a police academy in the northern city of Tikrit.
Authorities say four policemen were among those killed in blasts just minutes apart.
Separately, a roadside bomb killed an American soldier Sunday in eastern Baghdad. An American sailor assigned to a Marine Corps unit was killed by a bomb Saturday in the town of Fallujah.