PARIS (AP) _ Thirty percent of the buildings in historic Dubrovnik have been destroyed or seriously damaged in heavy bombardment by Serb-led federal troops, UNESCO says.

A statement Friday by the Paris-based U.N. organization said its two permanent observers in Dubrovnik, Colin Kaiser and Bruno Carnez, also told UNESCO's director general Federico Mayor that the fighting on Friday had left 11 people dead and 30 others injured.

Croatian radio reported four people died by early afternoon, and 25 others were wounded. Thousands have died in fighting since the republic of Croatia declared independence from Yugoslavia in June.

The UNESCO statement said that the buildings and sites of historic significance damaged in the fighting included a Dominican monastery and church, Saint-Blaise Church, the Sponza Palace, the Serbian Church and the Rupe Museum.

Mayor said he sent Yugoslavian Gen. Vejlko Kadijevic a telegram demanding an immediate cease fire in the bombardment of Dubrovnik, listed by UNESCO as a world historic site.