Aug 25 (Reuters) - Following are security developments in Iraq at 1700 GMT on Saturday: * updates or new items: * BAGHDAD - A parked car bomb killed seven people and wounded 30 others in the Kadhimiya district in northwestern Baghdad, police said. * BAGHDAD - Authorities imposed a limited curfew in the capital banning bicycles, motorcycles and carts ahead of a Shi'ite pilgrimage, but did not ban cars or trucks. * MOSUL - The body of a university lecturer was found in the southeast of the northern city of Mosul, five days after he was abducted, police said. * MOSUL - Five people were wounded including three policemen by three separate roadside bombs in Mosul, police said. * BAGHDAD - U.S. forces killed three gunmen and arrested 17 others in Muqdadiya 90 km (50 miles) north east of Baghdad, U.S. military said today. * ARAB JABOUR - U.S. forces said they discovered an execution site containing human skulls and decomposing bodies in Arab Jabour, an agricultural area on the southern outskirts of Baghdad. * BAGHDAD - U.S. forces said they and Iraqi troops had arrested nine militants in the Amel and Shula districts of the capital. BAGHDAD - Police said they found nine bodies in different districts in Baghdad on Friday. BAGHDAD - Gunmen attacked an Iraqi army patrol, killing one soldier and wounding two others in Mansour district in western Baghdad on Friday, police said. NAJAF - Gunmen killed a man in a drive-by shooting in Najaf, 160 km (100 miles) south of Baghdad, on Friday, police said. KIRKUK - Gunmen killed a man in a drive-by shooting in southern Kirkuk, 250 km (155 miles) north of Baghdad, on Friday, police said.