Mortar fire and a bomb killed at least four people in Baghdad on Sunday, while another bomb killed an oil company employee in north Iraq, security and medical officials said. Four mortar rounds hit the Shurta al-Rabea area in south Baghdad, killing at least two people and wounding 10, and a bomb explosion in a cafe in the Jamiyah area in the west of the city killed two people and wounded 12, officials said. A roadside bomb killed an engineer from the North Oil Company and wounded two other people in the northern city of Kirkuk, officials said. While violence has fallen from its peak during the sectarian conflict in 2006 and 2007, attacks are still common and have killed more than 200 people each month so far this year.