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There have been a string of attacks in Iraq this weekend which authorities are blaming on rogue elements of Sadr's Maudi Army.
Dozens die in attacks across Iraq
Iraqis mourn lost relatives after a stray rocket struck a residential building in Kamaliya, east Baghdad, on Sunday
Some relatives were mourning those struck by a stray rocket
A string of suicide attacks, shootings and rocket strikes have claimed dozens of lives on a day of violence in Iraq.
In the bloodiest single incident, 13 Iraqi soldiers died when a suicide attacker drove a fuel tanker into an army base in Mosul in northern Iraq.
Meanwhile, the US military said it killed 12 militants in a house east of Baquba, in Diyala province. It said they were preparing suicide attacks.
The bloodshed comes despite an overall reduction in violence since last June.
That was when the US deployed an extra 30,000 troops in violence-hit areas - the so-called "troop surge".
But Sunday's violence underlines the fragile, reversible nature of the apparent improvements in security, say correspondents.
Huge blast
At least 40 people were injured in Sunday's early-morning suicide strike in Mosul.
Smoke rises from the Green Zone in central Baghdad on Sunday, after it was targeted by a series of rockets or mortars
Sunday also saw a barrage of fire hit Baghdad's Green Zone
The suicide attacker ploughed an explosives-laden tanker into the army base, causing a massive blast.
Iraqi and US soldiers have been engaged in a major offensive in Mosul, which US commanders say is al-Qaeda's last urban stronghold in Iraq.
In another deadly attack, at least seven shoppers in a Baghdad market were killed when gunmen travelling in three cars opened fire.
At least 16 people were wounded when the drive-by shooting happened in the southern Zaafariniya area of the city, police said. The gunmen fled the scene.
In other violence:
* at least five people were killed by Katyusha rockets which apparently fell short of their target in Baghdad's heavily-fortified Green Zone
* at least five people were killed when a suicide bomber struck a queue outside a petrol station in the Shula district of Baghdad, police said
* a roadside bomb killed five Iraqi soldiers close to the city of Kirkuk - the scene of growing sectarian strife
Bodies 'shaved'
The attacks on the Green Zone - which began at about 0600 (0300 GMT) and caused no reported injuries - set the warlike tone of the day.
The first rocket barrage sounded like successive peals of thunder. It left a shroud of stinking black smoke over the city, reports the BBC's Adam Brookes.
Map
A second barrage followed about four hours later.
Our correspondent says previous rocket attacks on the Green Zone have been blamed on rogue elements of Moqtada Sadr's Mehdi Army militia, which is supposed to be observing a ceasefire.
Also on Sunday, the US military said it had killed 12 men in a raid east of Baquba city, in Diyala province.
Spokesman Major Winfield Danielson claimed six of the men killed were found to have shaved their bodies, which he said was "consistent with final preparation for suicide operations".
He added that a cache of weapons and ammunition had also been found in the raid and destroyed.
Dozens die in attacks across Iraq
Iraqis mourn lost relatives after a stray rocket struck a residential building in Kamaliya, east Baghdad, on Sunday
Some relatives were mourning those struck by a stray rocket
A string of suicide attacks, shootings and rocket strikes have claimed dozens of lives on a day of violence in Iraq.
In the bloodiest single incident, 13 Iraqi soldiers died when a suicide attacker drove a fuel tanker into an army base in Mosul in northern Iraq.
Meanwhile, the US military said it killed 12 militants in a house east of Baquba, in Diyala province. It said they were preparing suicide attacks.
The bloodshed comes despite an overall reduction in violence since last June.
That was when the US deployed an extra 30,000 troops in violence-hit areas - the so-called "troop surge".
But Sunday's violence underlines the fragile, reversible nature of the apparent improvements in security, say correspondents.
Huge blast
At least 40 people were injured in Sunday's early-morning suicide strike in Mosul.
Smoke rises from the Green Zone in central Baghdad on Sunday, after it was targeted by a series of rockets or mortars
Sunday also saw a barrage of fire hit Baghdad's Green Zone
The suicide attacker ploughed an explosives-laden tanker into the army base, causing a massive blast.
Iraqi and US soldiers have been engaged in a major offensive in Mosul, which US commanders say is al-Qaeda's last urban stronghold in Iraq.
In another deadly attack, at least seven shoppers in a Baghdad market were killed when gunmen travelling in three cars opened fire.
At least 16 people were wounded when the drive-by shooting happened in the southern Zaafariniya area of the city, police said. The gunmen fled the scene.
In other violence:
* at least five people were killed by Katyusha rockets which apparently fell short of their target in Baghdad's heavily-fortified Green Zone
* at least five people were killed when a suicide bomber struck a queue outside a petrol station in the Shula district of Baghdad, police said
* a roadside bomb killed five Iraqi soldiers close to the city of Kirkuk - the scene of growing sectarian strife
Bodies 'shaved'
The attacks on the Green Zone - which began at about 0600 (0300 GMT) and caused no reported injuries - set the warlike tone of the day.
The first rocket barrage sounded like successive peals of thunder. It left a shroud of stinking black smoke over the city, reports the BBC's Adam Brookes.
Map
A second barrage followed about four hours later.
Our correspondent says previous rocket attacks on the Green Zone have been blamed on rogue elements of Moqtada Sadr's Mehdi Army militia, which is supposed to be observing a ceasefire.
Also on Sunday, the US military said it had killed 12 men in a raid east of Baquba city, in Diyala province.
Spokesman Major Winfield Danielson claimed six of the men killed were found to have shaved their bodies, which he said was "consistent with final preparation for suicide operations".
He added that a cache of weapons and ammunition had also been found in the raid and destroyed.
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