March 28 (Reuters) - Following are security developments in Iraq at 1930 GMT on Friday.

* denotes new or updated item.

BASRA - At least 120 "enemy" fighters have been killed in a four-day-old Iraqi military operation against Shi'ite militias in the southern oil hub of Basra, said Major-General Ali Zaidan, commander of Iraqi ground forces in the operation.

* BAGHDAD - U.S. forces killed 13 insurgents during engagements across Baghdad, the U.S. military said.

* BAGHDAD - A U.S. helicopter fired a hellfire missile at gunmen firing from the roof of a building, killing four of them, in Sadr City, a U.S. military spokesman said. Police said 12 people were killed and 60 wounded in several U.S. air strikes on Sadr City.

* BAGHDAD - Seven bodies were found in Baghdad on Friday, police said.

* MAHMUDIYA - Seven people were killed and 15 others wounded in clashes between Mehdi Army fighters and Iraqi security forces in Mahmudiya, 30 km (20 miles) south of Baghdad, police said.

BAGHDAD - U.S. forces killed 27 insurgents during operations in different parts of Baghdad on Thursday, the U.S. military said.

* NUMANIYA - An Army Colonel, Jabar Rashid, was killed in clashes with Mehdi Army fighters in Numaniya, 120 km (72 miles) south of Baghdad, police said.

BASRA - U.S. warplanes dropped bombs for the first time in support of Iraqi forces cracking down on militants in Basra.

BAGHDAD - The Green Zone office of Vice President Tareq al-Hashemi was hit by a missile, but he was not there at the time. One security guard was killed, an official in his office said. Police said two people were killed by the salvo.

KARMA - Mortars killed two policemen and wounded 23 people including 13 policemen in Karma, a town 80 km (50 miles) north of Basra, police said.

BAGHDAD - A U.S. air strike in Baghdad's Kadhimiya neighbourhood killed three people and wounded six, police said.

DIWANIYA - Gunmen killed the mayor of the Ghmash neighbourhood in Diwaniya, 180 km (112 miles) south of Baghdad, sparking "very severe" clashes between Iraqi security forces and Mehdi Army fighters, police said. An office of Moqtada al-Sadr's followers was burned in retaliation.

KUT - Clashes between Mehdi Army fighters and Iraqi security forces killed three police officers and wounded two militants in Kut, 170 km (105 miles) southeast of Baghdad, police said.

KERBALA - Three gunmen were killed and seven others captured when they attacked an Iraqi army checkpoint in the Husseiniya district north of Kerbala, 110 km (68 miles) southeast of Baghdad, police said.

* NASSIRIYA - Fifteen people including three policemen were killed and 50 people wounded in clashes between Mehdi Army fighters and Iraqi security forces in Nassiriya, 375 km (235 miles) southwest of Baghdad, a hospital source said.

* HAMZA - Six policeman were killed and nine others wounded in clashes with Mehdi Army fighters in Hamza, 35 km (22 miles) south of Hilla, police said. Sixty-two gunmen were captured in these clashes.

* HILLA - Six policemen have been killed and 42 people including 30 policemen wounded in clashes between Iraqi security forces and Mehdi Army fighters since Tuesday across Hilla, 100 km (62 miles) south of Baghdad, police said. Eighty- five gunmen have been captured during these clashes, they said.

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