Al-Qaeda's front group in Iraq claimed it carried out a series of attacks, mostly on security forces, in the western province of Anbar in June and July, a statement posted on jihadist forums said.
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It comes after ISI declared a campaign last month to retake territory it had abandoned in the years since the peak of Iraq's sectarian bloodshed between 2006 and 2008.
Al-Qaeda in Iraq is regarded by Iraqi officials as significantly weaker than at the peak of its strength in 2006 and 2007, but it is still capable of spectacular mass-casualty attacks across the country.
The group claimed a wave of attacks on July 23 that killed 113 people nationwide, the deadliest violence to hit Iraq in more than two and a half years.