BAGHDAD — The Iraqi branch of Al Qaeda claimed responsibility Friday for a wave of coordinated bombings in the Baghdad area earlier this week, as new attacks killed another 14 people in the latest outbreak of violence to hit the country.
Friday’s deadliest attack came after nightfall in a Kurdish neighborhood in the ethnically mixed town of Tuz Khormato. Insurgents set off a nonlethal stun bomb apparently designed to attract a crowd before detonating a real bomb that killed 12 and wounded 10, said the town’s police chief, Colonel Hussein Ali Rasheed.
Tuz Khormato, a frequent flashpoint for violence, sits in a band of territory contested by Arabs, Kurds, and Turkomen about 130 miles north of Baghdad.
Iraq faces its deadliest wave of violence since 2008. The spike in bloodshed has created fears the country is heading back toward the brink of civil war fueled by the country’s sectarian and ethnic divisions.
Hours earlier, Al Qaeda in Iraq, called the Islamic State of Iraq and the Levant, posted a message on a militant website taking responsibility for the deadly attacks that rocked the Baghdad area Wednesday. Coordinated car bombings and other violence that day killed at least 82 people, mostly in Shi’ite areas of the capital.
The group claimed the attacks were a response to the Aug. 19 execution of 17 Sunni prisoners, all but one of them convicted on terrorism-related charges. It said tight security measures imposed by Iraqi forces failed to stop the attacks, and the group vowed to carry out more attacks against government targets.
‘‘We will avenge the blood of our brothers,’’ the group said.
The authenticity of the statement could not be independently confirmed. It was posted on a website commonly used by jihadists and its style was consistent with earlier Al Qaeda statements.
The bombings were the latest in a wave of bloodshed that has swept Iraq since April, killing more than 4,000 people and worsening already strained ties between Iraq’s Sunni minority and the Shi’ite-led government. More than 570 people have been killed so far in August.
Al Qaeda hopes to tap into the anger of more moderate Sunnis, who began holding rallies in December against the government because of what they feel is their second-class treatment. Among their biggest grievances are the application of tough antiterrorism measures they feel unfairly target their sect, and the treatment of Sunni detainees in Iraqi prisons.
Iraq has executed 67 people so far this year, mainly for terrorism-related charges. It put more people to death last year than any countries except China and Iran, according to Amnesty International. Human rights groups have raised questions about whether defendants receive a fair trial.
Also Friday, police said a gunman on a speeding motorbike opened fire on Sunni worshippers as they were traveled to a mosque for Friday prayer in the Sunni neighborhood of Adel in western Baghdad, killing two worshippers and wounding two others.
Attacks on Sunni mosques have been on the rise in recent months, raising fears that Shi’ite armed groups are starting to carry out retaliatory strikes. Most of the violence in recent years has been the work of Sunni extremists such as Al Qaeda.
Police also reported five more people killed and eight wounded in attacks in Baghdad the previous night. That brought the number of people killed in Iraq just on Thursday to 29.
Medics in a nearby hospital confirmed the casualty figures for all attacks. All officials spoke on condition of anonymity.