Iraq is facing its most relentless wave of bloodshed since the 2011 US military withdrawal, deepening fears that the country is heading back toward the widespread sectarian fighting that pushed it to the brink of civil war in the years after the invasion.
More than 500 people have been killed in May. April was Iraq's deadliest month since June 2008, according to a United Nations tally that put last month's death toll at more than 700.
Police officials also said that a roadside bomb exploded on a police patrol in the largely Shiite central commercial district of Karradah, killing three people there.
The Karradah blast shattered glass and twisted metal signs on several storefronts, and left the stricken police unit's modified Ford pickup truck charred and mangled.
More From This Section
"What have these innocent people done to deserve this?" asked witness Sinan Ali. "So many people were hurt. Who is responsible?"
Hospital officials confirmed the casualties.
In the northern city of Mosul, two police officers said a suicide bomber killed three when he blew himself up on a federal police checkpoint. Mosul is a former insurgent stronghold, located about 360 kilometers (225 miles) northwest of Baghdad.
All officials spoke on condition of anonymity because they weren't authorized to talk to the media.
There was no immediate claim of responsibility for the attacks but blame is likely to fall on al-Qaida's Iraq arm, which frequently carries out bombing attacks against civilians and security forces in an effort to undermine faith in the Shiite-led government.
The attacks came hours after bomb blasts tore through two Baghdad neighborhoods yesterday evening. At least 30 people were killed, including several members of a wedding party in the mixed Sunni-Shiite Jihad neighborhood.
The southwestern neighborhood was one of the earliest flashpoints in Baghdad's descent into sectarian bloodshed in the years following the 2003 U.S. Led invasion. It housed mainly Sunni civil servants and security officials under Saddam Hussein's regime, though many Shiites now live there too.