On Sunday, they refused to let U.N. convoys deliver goods to Muslim enclaves. After the 1994 market deaths, NATO threatened air strikes to force Serbs to withdraw artillery from around Sarajevo, bringing a period of relative calm. NATO jets swooped low over Sarajevo after Sunday's shelling but did not strike. U.N. officials said they had not requested NATO action despite a written request from Bosnian President Alija Izetbegovic. Another Catholic church was blown up near the northwest town of Bihac, and Serbs tried to burn a church at Vujnovici, north of Banja Luka, said Bishop Franjo Komarica in Banja Luka.
Religious buildings are frequent targets in the Yugoslav war.
Two Swiss and one German aid worker were freed from Serb captivity Sunday after ransom was paid for their release. The Serbs had claimed the aid workers were spying for the Muslim-led Bosnian government. Bosnia's war began in April 1992 when Serbs rebelled against the republic's vote to secede from Serb-dominated Yugoslavia. More than 200,000 people have been killed or are missing in fighting since then.