The tremor shook buildings in the centre of Belgrade, although reports said damage was not serious. Earlier, Serbian state television, RTS, went off the air in the middle of its late-night evening news bulletin, following a Nato strike on its main transmitter. There are likely to be further disagreements over Nato's planned oil embargo against Yugoslavia which is due to be put into effect on Friday. Speaking at the Pentagon, American Defence Secretary William Cohen said the US was in favour of using force if necessary to stop supplies getting through to Serbia. However, France says stopping and searching ships would require a United Nations mandate.
Correspondents also point out that Russia has failed to agree to adhere to an embargo.
The discussions follow Nato's admission that one of its missiles had accidentally hit a suburb of the Bulgarian capital, Sofia, on Thursday. The BBC is not responsible for the content of external internet sites.