Baghdad, Iraq ? U.N. inspectors hunted for weapons of mass destruction at missile plants and nuclear complexes Sunday, while an unusual visitor – Hollywood star Sean Penn – spoke out in Baghdad against a U.S. attack and in support of the Iraqi people caught up in an international crisis.

In Berlin, meanwhile, the German defense ministry said the United Nations had asked it to supply the inspection operation with unmanned spy aircraft to help in the search for banned Iraqi weapons or the facilities to make them.

A decision on whether to supply the LUNA drones and the technicians needed to maintain them likely will be made this week, said a ministry spokesman on customary condition of anonymity. German-U.S. relations were strained over Berlin’s opposition to attacking Saddam Hussein, but Berlin has pledged full support for the inspection program.

Also Sunday, coalition jets patrolling the southern no-fly zone over Iraq fired on two installations, a surface-to-air artillery battery and a mobile radar unit, after coming under fire, the U.S. Central Command reported on its Web site.

It said the sites were near An Nasiriyah, about 100 miles southeast of Baghdad, and Al Basra, 240 miles southeast of the capital. Coalition planes hit three targets in the southern no-fly zone Saturday.

Penn issued his comments at the end of a three-day visit to Iraq that was organized by the Institute for Public Accuracy, a research organization based in San Francisco.

“Simply put, if there is a war or continued sanctions against Iraq, the blood of Americans and Iraqis alike will be on our (American) hands,” Penn said at a news conference Sunday in the Iraqi capital.

U.N. inspectors hunting for banned weapons of mass destruction searched a missile plant south of Baghdad that the United States said had aroused suspicion. It was one of 10 sites the newly bolstered inspection team visited Sunday, according to Iraqi government officials and a statement by U.N. inspectors’ headquarters in Baghdad.

With the arrival of 15 inspectors Sunday and the routine departure of others in recent days, the total of U.N. sleuths now stands at 105, said Hiro Ueki, a spokesman for the U.N. program in Baghdad. On Saturday, the teams visited a dozen sites, a number Ueki said was the largest single-day site visitation since the inspectors returned to Iraq on Nov. 27 after a four-year hiatus.

The sites visited Sunday included al-Mutasim, a government missile plant occupying the grounds of a former nuclear facility 46 miles south of Baghdad, the inspectors said. As usual, they offered no details on what they sought or found.