Ethnic Albanians torched Serb homes and churches Thursday as
Kosovo convulsed in a second day of violence, its worst since
the province's war ended in 1999.  Serbian nationalists set
mosques elsewhere on fire and threatened to retaliate with
"slaughter and death," and NATO sent reinforcements to quell
tensions in the U.N.-run province and ease the threat of renewed
conflict in the volatile Balkans.  The clashes, which began
Wednesday when ethnic Albanians (search) blamed Serbs
(search) for the drownings of two children, have killed at least
22 people and wounded hundreds more, including several dozen
U.N. police and NATO peacekeepers.  The bloodshed underscored
the bitter divisions that have polarized Kosovo's mostly Muslim
ethnic Albanians, who want independence from Serbia, and
Orthodox Christian Serbs, a minority in Kosovo (search) who
consider the province their ancient homeland.  The violence,
which spilled beyond Kosovo's borders into the Serbian
heartland, also dealt the Bush administration a potential