FACTBOX: Security developments in Iraq

(Reuters) - Following are security developments in Iraq at 3 p.m. EDT on Tuesday:

* denotes a new or updated item.

* BAGHDAD - A powerful car bomb exploded in a crowded market area of Baghdad, killing 51 people and wounding 75, police said.

* BAGHDAD - A civil servant was killed and another wounded when the car they were traveling in was attacked by armed men in the west Baghdad district of Mansour, police said.

* TUZ KHURMATO - A municipal worker was killed in a drive-by shooting in Tuz Khurmato, 170 km (105 miles) north of Baghdad, police said.

KUT - A roadside bomb killed a police colonel and his two guards and wounded four other policemen as they pursued gunmen in a car chase just outside the town of Kut, 150 km (95 miles) southeast of Baghdad, police said.

BAQUBA - A parked car bomb exploded outside police headquarters in central Baquba, 65 km (40 miles) northeast of Baghdad, killing a policeman and wounding 20 other people, including 10 policemen, police said.

MOSUL - Gunmen broke into a house and shot dead a woman, in Mosul, 390 km (240 miles) north of Baghdad, police said.

MOSUL - Gunmen shot dead an off-duty policeman near his house in central Mosul, police said.

BAGHDAD - A suicide bomber riding a motorcycle killed four U.S.-backed neighborhood security guards at a checkpoint in northern Baghdad, police said. Two civilians were wounded.

HILLA - A U.S. soldier was killed in a roadside bomb attack southeast of Hilla, 100 km (60 miles) south of Baghdad, on Monday, U.S. forces said.

DIYALA - Three brothers were kidnapped at a fake checkpoint in Diyala province, northeast of Baghdad, police said.

BAGHDAD - A roadside bomb targeted a police commando patrol, wounding three policemen and one civilian in Ghadir district of eastern Baghdad, police said.

(Compiled by Khalid al-Ansary, editing by Tim Cocks)