EVIDENCE IS SEEN LINKING BIN LADEN TO ALGERIAN GROUP
US investigators have uncovered what they believe are links between Algerians who have been charged with plotting terrorist attack in US and Osama bin Laden, exiled Saudi accused of bombing two US Embassies in East Africa; authorities in Senegal recently arrested Mohambedou Ould Slahi; US investigators believe that he directed Algerian group in Canada in its efforts to enter US and carry out bomb plot late last year; say Slahi is brother-in-law of one of bin Laden's key lieutenants, but they refuse to identify him; bomb plot was foiled when border agents in Port Angeles, Wash, on Dec 14 arrested Ahmed Ressam, Algerian who was driving car loaded with explosives (M)