NICOSIA, CYPRUS -- Iran said it fired a surface-to-surface missile at the Air Force building in the Iraqi capital of Baghdad early today.

According to Tehran radio, monitored here, Iran's Revolutionary Guards said the attack was in retaliation for Iraqi air raids on civilian areas in Khuzestan and Fars provinces.

The last reported Iranian missile attack on Baghdad, on Oct. 13, slammed into an elementary school, killing 29 children and three adults, according to Iraqi accounts.

News agencies reported from Manama, Bahrain, that Iranian warplanes and ground forces struck military and industrial targets in southern Iraq yesterday, killing at least six people, according to Iraq.

Iranian bombers attacked "enemy positions, concentration centers and military-economic installations" in Tib, near Amarah, 190 miles southeast of Baghdad, IRNA said.

Iranian ground forces used long-range artillery on Iraqi positions in southern Iraq, with a 20-hour barrage that raged until yesterday afternoon, IRNA said. Iraq said six people were killed in the shelling and 23 were wounded.

Meanwhile, Yuli Vorontsov, a Soviet deputy foreign minister, met with Iraqi President Saddam Hussein in an effort to persuade Iran and Iraq to accept a U.N.-sponsored cease-fire. Vorontsov is to visit Kuwait today and Iran this weekend.