Riot police are reported to have taken up positions around Slobodan Milosevic's house in Belgrade.
CNN say it's not clear if the former Yugoslav president is in the house.
Mr Slobodan Milosevic
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The US Congress set the March 31st deadline for Belgrade to begin cooperation with the Hague-based International Criminal Tribunal for the former Yugoslavia (ICTY), and failure to comply could result in the loss of US support for much needed economic assistance and loans from the International Monetary Fund and the World Bank.
Mr Cedomir Jovanovic, a high-ranking official of Serbia's ruling DOS coalition insisted the US demands "are not an ultimatum," but "a stance which should be respected."
"There is no sense in confronting the world by refusing cooperation with the ICTY," Mr Jovanovic said.
Mr Milosevic and four of his allies have been indicted by the ICTY for war crimes allegedly committed in Kosovo in 1999.
AFP