NEW : If civilians were killed , deaths may constitute war crimes , spokesman says . Comment: They then sought out and killed civilians , particularly men , whom they accused of supporting their enemies , the groups said . Cease-fire in Congo unraveling in third straight day of fighting . Battles between warlord Laurent Nkunda 's rebels and army spreading , U.N. says .
NEW : If civilians were killed , deaths may constitute war crimes , spokesman says . Comment: Cease-fire in Congo unraveling in third straight day of fighting . Battles between warlord Laurent Nkunda 's rebels and army spreading , U.N. says .