At least 11 people have been killed and 21 others injured after two bomb blasts rocked the central Iraqi city of Ramadi.The explosions targeted a group of anti-al-Qaeda militiamen in the village of Zangoura on the outskirts of Ramadi, the largest city in Anbar Province, on Friday. Security officials said the first bomb was planted in a car belonging to the militia and the second one was placed on the roadside. No one has yet claimed responsibility for the attack. There has been recently an upsurge in violence across Iraq, and the authorities say Qatar and Saudi Arabia have had a hand in some of the deadly incidents. As recently as Thursday, a series of bombings killed at least 36 people in Baghdad and nearby towns. The United Nations says a total of 1,045 people were killed and nearly 2,400 were injured in violent incidents across Iraq in May. Earlier this month, UN Secretary-General Ban Ki-moon’s Special Representative for Iraq Martin Kobler called on the Iraqi leaders to “sit together” and address the country’s problems, including car bomb attacks throughout Iraq. Iraqi Prime Minister Nouri al-Maliki has said that militant groups and the remnants of the former Ba’athist regime are responsible for the latest wave of violence in the country.