BELGRADE, Serbia-Montenegro (AP) - Four ethnic Albanian children told a court Wednesday how Serb forces rounded up and gunned down their families with automatic weapons in one of the most brutal acts of the 1998-99 Kosovo war. Their testimony came during the trial of a Serb police officer accused of leading an assassination squad through their community during the war. The children, who were said to have positively identified the officer, Sasa Cvjetan, in his prison cell Tuesday, watched as Serb troops slaughtered 19 ethnic Albanian relatives, including their mothers, siblings and grandparents, on March 28, 1999, in the town...