Around 280 Roma were returned to Romania and Bulgaria this week, as part of a plan to return around 800 people by the end of August.
At least 70 families living in an informal settlement in Belgrade, many of whom fled there after being forcibly evicted from other sites, could be left homeless again if the demolition goes ahead.
Amnesty International calls on President Nicolas Sarkozy to work to combat discrimination against Roma and Travellers, ahead of a meeting to discuss "problems" relating to their "behaviour".
Police and security forces urged not to use excessive force while restoring public order after three days of violent unrest.
Prime Minister Robert Fico has announced a proposal to take the children from the settlements where they live and place them in boarding schools.
A Romani woman was shot dead in the village of Kisléta in Eastern Hungary, early Monday morning.