A roadside bomb killed four Iraqi soldiers north of Baghdad on Friday, security and medical officials said a day after 33 people were killed in attacks mainly targeting the security forces. The bomb targeted an army patrol east of Dhuluiyah, killing four soldiers, among them a major, and wounding four others, an army captain and a medical source said. Insurgents attacked a military base near Dhuluiyah on July 23, killing at least 15 soldiers and wounding two more. At least 43 people have now been killed so far in August, among them 30 members of the security forces. Official figures put the number of people killed in attacks in July at 325, the highest monthly death toll since August 2010. While violence has decreased compared to its peak in 2006 and 2007, attacks remain common across Iraq. There were attacks on 27 of the 31 days in July.