World IN BRIEF : BALKANS : Yugoslav Army Shells Bosnians

Yugoslav and Bosnian government forces dueled with artillery in a sharp escalation of the civil war in Bosnia-Herzegovina, while Bosnian troops fought to cut off rebel Serbs from their Yugoslav allies. The cross-border shelling marked the first time Yugoslavia has acknowledged intervening in the war since withdrawing its troops from the former Yugoslav republic seven months ago. Serbian rebels said the offensive by Bosnia’s Muslim-led government near the Yugoslav border was the biggest in the region since the war began. A U.N. convoy, meanwhile, reportedly reached a Muslim-held town in eastern Bosnia that had been cut off by Serb militants for months. The convoy was carrying tons of relief supplies to Zepa.