African leaders meeting Wednesday in Tanzania on appealedto the U.N. Security Council to impose sanctions onBurundi's National Liberation Forces, which said itsfighters staged the attack because Burundian soldiers andCongolese Tutsi militiamen were hiding among the refugees. Burundian officials and witnesses said the rebels wereaccompanied by Hutu extremists based in Congo. Belgian officials said Brussels would seek to discover ifother groups were involved in the killings before proposinga response. Foreign Ministry spokesman Patrick Hermandeclined to rule out European Union sanctions against thosefound to be involved. Last year, the EU sent peacekeeping troops to easternCongo to halt killings in northeastern Ituri province,which borders Uganda. The massacre has revived fears of yet more violencebetween the Hutu and Tutsi ethnic groups, which has spawneddecades of mayhem in Africa's Great Lakes region includingthe 1994 genocide of Rwandan Tutsis and a war in Congo thatsucked in several neighboring nations. Amid a flurry of diplomatic initiatives to contain thetension, De Gucht called for a meeting of ministers fromregion on the sidelines of the U.N. General Assembly nextmonth in New York and said he would soon tour the areahimself. The Belgian minister plans to meet his Burundiancounterpart Terence Sinunguruza in Brussels next week.--SPA1418 Local Time 1118 GMT www.spa.gov.sa/193262