The oath-taking ceremony of the Olympics was held in Beijing on Tuesday on the eve of the 100-day countdown to the Beijing Olympic Games.

Security forces have conducted various exercises to simulate any likely emergency situation the Games may face.

Top official, Zhou Yongkang, says security forces for the Beijing Olympics will remain on high-alert to prevent terrorist attacks.

Zhou Yongkang says security work for the Olympics has entered a crucial period. He has ordered security forces to stay on full alert -- to ensure the torch relay goes smoothly and to safeguard the Olympic venues, participants and visitors.

Among those attending the ceremony were BOCOG President and CPC Beijing Committee Secretary, Liu Qi and Minister of Public Security, Meng Jianzhu.

Security forces have conducted various exercises to simulate any likely emergency situation the Games may face.

Among the anti-terror drills, police staged a car chase to entrap a stolen car.

In one scenario, security forces clad in road maintenance crew attire intercepted a hijacked bus.

In another security drill, men in black descended from helicopters and rappelled down buildings to free tourists taken hostage by a group of people.

Later, special forces displayed their skills in choreographed martial arts routines.

(CCTV April 30, 2008)