BANGKOK - A motorcycle bomb exploded in a market in Thailand's southern Yala province on Monday, killing three people and wounding 18, a spokesman for the Internal Security Operations Command (ISOC) said. The mostly Muslim provinces of Narathiwat, Pattani and Yala in Thailand's far south are home to a long-running insurgency by ethnic Malay Muslims fighting for autonomy in which more than 6,000 people have been killed since 2004. 'The criminals put a bomb in a motorcycle and placed it next to a market cart. The force of the explosion caused three people to lose their lives,' ISOC spokesman Pramote Prom-in said. The ISOC is a government security force that operates in the region. No group claimed immediate responsibility for the attack.