sentences:  FBI San Juan personnel worked closely with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) to identify suspects and build cases against them.The union representing the hotel employees denied that it or any of its members had been involved in starting the fire, and offered a $15,000 reward for information that would help the investigation.In April 1987, union members Héctor Escudero Aponte, 35; Armando Jiménez Rivera, 29; and José Francisco Rivera López, 40, pleaded guilty to setting the New Year's Eve fire.