Pubdate: Tue, 12 Aug 1997 By Karl Penhaul BOGOTA, Aug 11 (Reuter) The missing publisher of a Colombian newspaper is believed to have been kidnapped in retaliation for his hardhitting columns, police said on Monday. Ulido Acevedo Silva, 38, editor and founder of the Hoy Diario del Magdalena newspaper, disappeared from his office in the Caribbean port city of Santa Marta on Friday afternoon. His secretary later received an anonymous phone call saying he had been abducted but no ransom demand was made, police said. The journalist had been granted police protection two months ago after receiving anonymous death threats but he later left the city and the protection was suspended. ``The trail has gone quite cold. We don't know what group was responsible,'' regional police chief Col. Octavio Grajales said in a telephone interview. Drug trafficking and smuggling is rife in Santa Marta, one of the main ports on Colombia's Caribbean coast, and leftwing guerrillas are active in the surrounding countryside. Acevedo's daily opinion columns covered a wide variety of subjects, including drug smuggling and political violence, said Ives Ramirez, the newspaper's administrator. ``We have no idea who is behind Ulido's disappearance,'' Ramirez told Reuters. ``His columns were always impartial.'' Acevedo, who is married with four children, founded the newspaper three years ago after working as regional news director in Santa Marta for the Caracol radio network. His disappearance is the latest in a series of attacks against journalists in Colombia. In March this year, Gerardo Bedoya, editorialist for the respected El Pais newspaper in the southwest city of Cali, was murdered by a driveby assassin after a series of outspoken attacks on drugrelated corruption. His death coincided with the killing of photographer Freddy Elles, who worked for the El Espectador and Heraldo de Barranquilla newspapers, who was found handcuffed and stabbed in the Caribbean resort of Cartagena. In the late 1980s, the Medellin cocaine cartel kidnapped a number of prominent journalists as part of a violent campaign to force the government to ban extradition. Since 1975, more than 100 journalists have been killed in Colombia, according to the Interamerican Press Association. REUTER 14:26 081197