FACTBOX: Security developments in Iraq, May 6

(Reuters) - Following are security developments in Iraq at 10 a.m. EDT on Tuesday.

* denotes new or updated item

* TIKRIT - A bomb in a parked car killed at least four people and wounded 21 in Tikrit, 175 km (110 miles) north of Baghdad, police said.

* MOSUL - A roadside bomb hit an Iraqi army patrol, killing one soldier and wounding two in western Mosul, 390 km (240 miles) north of Baghdad, police said.

* MOSUL - Two militants accidentally blew themselves up trying to place a bomb on a road south of Mosul, police said.

* BAGHDAD - The Iraqi army arrested 97 militants in various parts of Iraq in the previous 24 hours, the Defense Ministry said.

BAGHDAD - Gunmen killed Ayad Hamza, the deputy director of Nahrain University in charge of sciences, and wounded his two sons in a drive-by shooting on Sunday in Mansour district, western Baghdad, an Education Ministry spokeswoman said.

BAGHDAD - Iraqi special forces and U.S. troops killed seven militiamen and detained two others in two battles in Baghdad on Monday and Tuesday, the U.S. military said.

BAGHDAD - Iraqi and U.S. forces detained 15 militants in operations against al Qaeda in different parts of the country, the U.S. military said.

BAGHDAD - Three people were killed, including a female college student, and nine wounded in clashes between police and militants in Abu Dsheer district, south Baghdad, police said.

KIRKUK - A roadside bomb killed one policeman and wounded seven on Monday in Kirkuk, 250 km (155 miles) north of Baghdad, the U.S. military said.

BAGHDAD - Two mortar bombs killed three people and wounded 10, including four officers from the Facility Protection Services, which guards government buildings and infrastructure, near Baghdad's municipal headquarters, police said.

BAGHDAD - A Katyusha missile wounded five people, some of them students, when it landed near the privately owned Al-Mansour University College, in Karrada district, central Baghdad, police said.

MOSUL - Gunmen ambushed a police patrol, killing two policemen and a civilian and wounding two other policemen in western Mosul, police said.

BAGHDAD - Two mortars wounded 12 people, including five policemen, near Utaifiya neighborhood in central Baghdad, police said.

BAGHDAD - Iraqi and U.S. soldiers killed nine militants and discovered weapons caches during night raids in Baghdad on Monday and Tuesday, the U.S. military said.

DIYALA PROVINCE - Militants attacked an Iraqi Army checkpoint, killing 10 soldiers and wounding 13 others on Monday in Diyala province, northeast of Baghdad, the U.S. military said.

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

MOSUL - Gunmen stormed a house in eastern Mosul, on Monday, killing one person, police said.

BAGHDAD - U.S. forces killed two militants and discovered two weapons caches in Baghdad on Monday, the U.S. military said.

BAGHDAD - Iraqi security forces killed 10 militants, arrested 131 others and seized a quantity of weapons during two days of operations in Shula district, northwestern Baghdad, an Iraqi security force spokesman said.

OTHER DEVELOPMENTS:

BAGHDAD - The third of five U.S. "surge" brigades is being withdrawn from Baghdad in the next several weeks, the U.S. military said in a statement. About 3,500 soldiers from the 3rd Brigade, 3rd Infantry Division are returning home to Fort Benning, Georgia.

(Compiled by Aws Qusay, editing by Tim Cocks)