FACTBOX: Security developments in Iraq

(Reuters) - Following are security developments in Iraq at 1500 GMT (11 a.m. EDT) on Saturday.

* denotes new or updated items.

* BAGHDAD - A roadside bomb killed one U.S. soldier and wounded three during combat operations in southern Baghdad, U.S. military said.

SAMARRA - Iraqi army, police and local groups working with U.S. forces known as "concerned citizens" killed eight gunmen, detained 37 and liberated 27 truck drivers held hostage during an operation on Thursday southwest of Samarra, 100 km (62 miles) north of Baghdad. Four members of the Iraqi security forces and four concerned citizens were killed, U.S. military said.

BAGHDAD - U.S. forces killed six gunmen and detained 18 others in operations targeting Sunni Islamist militants in central and northern Iraq, U.S. military said.

FALLUJA - Iraqi police killed a gunman and detained 12 others in an operation on Friday in Falluja, 50 km (32 miles) west of Baghdad, police said.

SALMAN PAK - Three mortar bombs killed a civilian and wounded four others in Salman Pak, 45 km (25 miles) south of Baghdad, police said.

BAGHDAD - Four bodies were found in different districts of Baghdad on Friday, police said.

NEAR HAWIJA - Gunmen killed a police lieutenant and wounded a civilian when they shot at their car outside Hawija, 70 km (43 miles) southwest of Kirkuk, police said.