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.