Following are security developments in Iraq as of 1730 GMT on Sunday, according to Reuters: * denotes a new or updated item. * TIKRIT - A U.S. soldier assigned to an engineering group was killed and another was wounded in an explosion on Saturday in northern Iraq, the U.S. military said. It did not say what caused the explosion. * BALAD - Gunmen kidnapped two Iraqi army officers and a soldier at a fake checkpoint in Balad, 80 km (50 miles) north of Baghdad, police said. * BAIJI - Police found a severed head in Baiji, 180 km (112 miles) north of Baghdad, police said. BAGHDAD - Police in Baghdad found 40 bodies, many tortured and shot dead, in different parts of the capital in the past 24 hours, an interior ministry source said. MADAEN - Four Iraqi policemen were killed in clashes with gunmen in Madaen, just south of Baghdad, an interior ministry source said. BAGHDAD - Two mortar rounds hit the Palestine Street district in Baghdad, wounding eight people, an interior ministry source said. BAGHDAD - Iraqi special forces soldiers detained 19 men during operations against a militant leader believed responsible for coordinating kidnappings, murders, roadside bombs and mortar attacks, the U.S. military said. BASRA - Two policemen were killed and a police major was wounded by gunmen in Basra, police said. BAGHDAD - U.S. forces captured 10 suspected insurgents, including a high value target, in eastern Baghdad, the U.S. military said. FALLUJA - Iraqi soldiers detained six men in operations near Falluja aimed at al Qaeda members, the U.S. military said. BAGHDAD - Iraqi soldiers killed seven suspected insurgents and detained three more in the Haifa Street area where they have kept a heightened security presence since a major operation to clear insurgents earlier this week, the U.S. military said. BAGHDAD - Iraqi police and army backed by U.S. forces launched an operation Doura, in southern Baghdad, "to disrupt terrorist and illegally armed militia activity", the U.S. military said. Nine suspects were detained. BAGHDAD - The Defence Ministry said Iraqi troops arrested 32 suspected insurgents in the Abu Ghraib area of Baghdad and 50 more in Diyala province, north of the capital. It said troops also found a weapons cache that included 1,969 Katyusha rockets during the operation in Diyala. It did not say when it happened. MOSUL - Gunmen killed two people, including a lieutenant colonel in the former Iraqi army, in central Mosul, police said. MOSUL - Gunmen killed an army captain in central Mosul, police said. BAGHDAD - Gunmen killed two brothers working as guards for Iraqiya state television on Saturday in Doura district in southern Baghdad, an employee at Iraqiya said. MOSUL - Gunmen killed a dentist in Mosul, police said. BAGHDAD - Gunmen opened fire randomly and killed at least two people in the southern Saidiya district of Baghdad, police said. MOSUL - Gunmen opened fire at a gathering of people, killing three and wounded three in Mosul, police said. KIRKUK - A member of the Patriotic Union of Kurdistan survived a roadside bomb attack in Kirkuk, 250 km (155 miles) north of Baghdad, police said. KIRKUK - Police found the body of a man shot in the head, in Kirkuk, police said. MOSUL - Gunmen killed two men in two different incidents in Mosul, police said. BAGHDAD - A roadside bomb killed a person and wounded six near al-Tayaran Square in central Baghdad, an Interior Ministry source said. MOSUL - The bodies of nine people, with gunshot wounds, were brought to the morgue in the northern city of Mosul, 390 km (240 miles) north of Baghdad, a source in the morgue said. MOSUL - Several mortar rounds landed on a residential district, wounding five people on Saturday in Mosul, police said. ISKANDARIYA - Gunmen attacked a private factory and killed three workers and wounded another on Saturday night in the town of Iskandariya, 40 km (25 miles) south of Baghdad, police said.