BAGHDAD : Three bomb attacks in Iraq on Wednesday killed 11 people, including four anti-Qaeda fighters who died when a suicide bomber struck as they gathered to collect their salaries, officials said.The bomber, who was on foot, detonated explosives at a police station in Fallujah, west of Baghdad, as the militiamen, known as Sahwa, gathered near a police station, police Lieutenant Colonel Khaled Yassir al-Jumaili said. The blast killed five people, including a senior police officer and four Sahwa fighters. It also wounded 15 other people.Meanwhile, violence in Iraq rose sharply in April, with 460 people killed according to a AFP figures, raising fears of a return to the all-out sectarian conflict that plagued the country in past years.The majority of the deaths came during a wave of unrest that began on April 23 when security forces moved on Sunni anti-government protesters near the northern Sunni Arab town of Hawijah, sparking clashes that killed 53 people.Dozens more people died in subsequent violence that included revenge attacks on security forces. The demonstrations erupted in Sunni areas of Shiite-majority Iraq more than four months ago.