Iraq's first female suicide bomber blew herself up outside a US military office in the northern Iraqi town of Tal Afar on Wednesday, killing herself and at least five others and wounding 53, police said.
It marked the first time since an insurgency by Sunni Arabs began that a female suicide bomber had launched an attack in Iraq, in a new tactic common among Chechen suicide bombers operating in Russia but rare in the Middle East.
The US military said in a statement the bomb targeted Iraqi citizens filing for compensation at a Civil Military Operations Centre. Iraqis visit such centres to claim compensation if they lose relatives, or suffer damage to property, because of US military action.
Iraqi police said earlier the explosion was at an army recruitment centre where many people were queuing to join up.
"A suicide bomber blew herself up in front of the recruitment centre. This centre was supposed to be open today for volunteers," Iraqi general, Nejam Abdullah, said.
Police had earlier said seven died in the explosion. The US military said five died and 30 were wounded.
The centre was opened after a joint Iraqi-US military operation which US forces said had effectively rid Tal Afar of what they called "terrorists and foreign fighters".
The bombing came a day after the US military said it had killed the man it called al Qaeda's number two figure in Iraq.
Abu Azzam was deputy to the organisation's leader, Abu Musab al-Zarqawi, Iraq's most wanted man, the US military said, although al Qaeda ridiculed this claim in an Internet statement. Abu Azzam was killed on Sunday.
The American military called his death a serious blow to the militant group at the heart of Iraq's insurgency. But suicide bombings have continued since his death.
Wednesday's attack mirrored a suicide bombing of a recruitment centre in Baquba, 65 km (40 miles) north of Baghdad, on Tuesday. At least 10 died in that blast, with around 30 wounded.
TAL AFAR OPERATIONS SAID FINISHED:
Iraqi and US troops recently ended a joint military operation in Tal Afar, which they say has long been a stronghold of insurgents. The US military said during the operation it killed or captured over 500 people whom it called "terrorists or foreign fighters".
They hailed the full-scale assault on the town as a success and said they had brought Tal Afar, which US forces say has been used as a conduit for foreign fighters entering Iraq from Syria, back under their control.
But previous military operations against insurgency strongholds have not led to peace, and sectarian violence continued on Wednesday.
Police found seven bodies in the town of Taji, north of Baghdad. They had all been shot and the bodies were handcuffed and blindfolded. And police said a group of men in commando uniforms had detained six people on Tuesday in the Huriya district of Baghdad. They were found in a morgue shot dead.
Iraq's Shia and Kurdish-dominated government is facing an insurgency from the country's Sunni Arab minority, and violence has escalated in the run-up to an October 15 referendum on a contentious new constitution for the post-Saddam Hussein era.
Sunnis have dominated Iraq for decades, under Saddam and before, but their influence has all but gone since his ouster.
They fear the new constitution will formalise their reduced role by giving greater autonomy to the southern Shias, in line with that already enjoyed by northern Kurds - including control of oil revenues, the mainstay of Iraq's battered economy.
Many Sunnis have vowed to work for the rejection of the new charter at the referendum.
Hundreds have died in bombings, suicide attacks and shootings across Iraq in recent weeks, amid fears that sectarian violence between Sunnis and Shias may ignite a civil war.