By Estelle Shirbon LONDON, Jan 19 (Reuters) - BP said on Saturday that 14 of its 18 employees at the In Amenas plant in Algeria were safe but the fate of the remaining four remained unknown as the hostage crisis there was drawing to a close. "While not confirmed, tragically we have grave fears that we are likely to have suffered one or more casualties," said Bob Dudley, chief executive of the oil and gas giant, during a conference call with reporters.