Aid flights resumed to Sarajevo Friday, but Serbs blocked vital supplies to hard-pressed Muslim enclaves in eastern Bosnia and to tens of thousands of hungry civilians in the embattled northwest.

The four-month truce in Bosnia looked increasingly tattered as fresh sniping wounded three people in 10 minutes near Sarajevo's Holiday Inn. Another civilian was wounded in sniping near the airport. Two civilians, one Serb and on Muslim, were killed by sniper fire in the capital Thursday.Friday began with harmless shots in the air as Sarajevo residents celebrated the end of the Muslim fast of Ramadan.

But just after noon fire rang out from the notorious "Red House," where both government and Serb snipers operate, eyewitnesses and French U.N. peacekeepers said. Two passengers on a tram were wounded, prompting the streetcar service to be suspended for a second day.

The only bright spot was the resumption of flights to Sarajevo airport, suspended Thursday when a U.N. plane carrying senior American diplomats was fired upon. It was the fourth plane hit at the airport in six days.

U.N. spokeswoman Capt. Myriam Socachy said the first two U.N. relief flights landed and left without incident Friday. A total of 19 military and aid flights were scheduled.

But in the eastern Muslim enclaves of Srebrenica, Zepa and Gorazde, food, fuel and medical supplies were so short that a U.N. official was sent to the Bosnian Serb stronghold of Pale Friday to press for permission to bring in convoys.

"The situation is deteriorating," said U.N. spokesman Lt. Col. Gary Coward.

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