SEOUL, South Korea's spy agency called for caution on Monday for South Korean nationals traveling or living abroad, citing a potential threat of terrorist attacks. The National Intelligence Service (NIS) issued the warning, citing the deadly shooting at the University of Nevada, Las Vegas, and the stabbing attack of a tourist in Paris, both of which occurred in December. Las Vegas and Paris are among popular destinations for South Korean tourists. Two South Korean men in their 50s and 60s were released late last month, 17 days after being abducted by an armed group in Nigeria on Dec. 12. Source: Yonhap News Agency