Communications breakdowns led to last month's downing of Captain Scott O'Grady's F-16 over Bosnia, according to a Pentagon report. The report says intelligence photos revealed four hours before the plane was hit that Serb SA-6 missile battery had moved into the flyover area. Just minutes before impact, an American U-2 plane detected a brief burst of radar from the battery, revealing its position. But a command plane lacking crucial communications gear was unable to relay the message to O'Grady. Pentagon officials will present the report to Congress tomorrow.