Hundreds of supporters from Serbian rightist and ultranationalist organizations, some waving Russian flags, rallied in downtown Belgrade in support of Kosovar Serbs, demanding the Serbian government intervene in Kosovo. Protesters waved flags and chanted "Kosovo is Serbia." Tempers are flaring again between Serbia and Kosovo, a former Serbian province that declared independence. Tensions have simmered ever since the 1998-99 war in Kosovo that claimed more than 10,000 lives and left over 1 million homeless.