TURMOIL IN THE BALKANS : Peacekeepers Deliberately Attacked, U.N. Says : Bosnia: Mortar fire wounds a French soldier and three others. Red Cross pushes for greater access to prison camps.

Mortar rounds that slammed into the headquarters of U.N. peacekeepers in Sarajevo and seriously wounded a French soldier were deliberately aimed at the United Nations, officials said Friday.

The attack, which occurred late Thursday, “was a direct attack on the United Nations,” U.N. spokesman Mik Magnusson said. “It was unquestionably intentional.”

Meanwhile, the Red Cross said it has visited 10 detention centers in Bosnia and found harsh conditions but no evidence so far of Nazi-style death camps.

And at the United Nations, Bosnian Ambassador Mohammed Sacirby released a report showing that U.N. peacekeepers knew about summary executions of Bosnian Muslims as far back as May. The report was written by a peacekeeper and based on interviews with 18 witnesses, but officials said that it was never forwarded to the Security Council so that it could consider action.

The memo was passed part of the way up the bureaucratic chain of command, then referred to the Red Cross, which continues to demand admission for its inspectors into all of the camps.

Also Friday, Yugoslav Prime Minister Milan Panic said he will order Serbian officials in Bosnia to close the camps within 30 days or resign. But he acknowledged that he has only moral authority over Serbs in Bosnia.

In Budapest, Hungary, Panic and his Croatian counterpart, Franjo Greguric, agreed on the exchange of 1,500 prisoners, including 400 Serbs, scheduled to take place Aug. 14.

Pierre Gauthier, spokesman for the International Committee of the Red Cross, said that the Swiss-run agency hopes to gain access soon to a camp at Omarska, Bosnia, the scene of reported beatings, starvation and the executions of hundreds of prisoners.

Gauthier said that, so far, Red Cross representatives have visited 4,200 prisoners at 10 internment centers in Bosnia, three of them run by Serbs.

“If we had found any death camps (up to now), we would have been obliged to shout (about it),” Gauthier said. “For the moment, this isn’t the case.”

In Sarajevo, spokesman Magnusson said three mortar bombs were fired at the U.N. headquarters in a post office building. But he declined to say whether Serbian forces besieging Sarajevo or the city’s Muslim defenders were responsible for the attack.

“One shot was a ranging round, the other two direct hits on the building,” he said. Apart from the French soldier, three other people were hurt, Magnusson said.

One shell punched a hole all the way through the 20-inch-thick reinforced concrete deck into the basement of the building.

Inside the headquarters, one room that four Ukrainian peacekeepers had just vacated was demolished.

Gen. Philippe Morillon, deputy commander of U.N. peacekeepers in the former Yugoslavia, told reporters that “no (U.N.) military solution exists” for today’s crisis in the Balkans.

“I’m a soldier, and I know perfectly well that (U.N.) military intervention will mean 100,000 more casualties and dead,” he said.

Morillon also declared he had received “firm commitments” from both sides to work toward reopening Sarajevo’s airport--closed because of heavy fighting--and helping to secure a road corridor from the Croatian port of Split to Sarajevo and from Sarajevo to Gorazde.

Gorazde, the last stronghold of Bosnian government forces in eastern Bosnia, has been under siege for more than three months.