BANGKOK, May 18 (Xinhua) -- The Thai government's Centre for the Resolution of Emergency Situation (CRES) said Tuesday morning anti-government core leader Nattawut Saikua is a major terrorist, the Thai News Agency reported. Also, the CRES said troops will continue with operations to besiege the main rally site Rajprasong area, aiming to pressure the anti-government protestors to end their over-two-month long rally. Meanwhile, by this time the CRES has viewed that it is still not essential to impose a curfew in Thailand's capital Bangkok.about: