Former Chinese President Hu Jintao was escorted from the Chinese Communist Party (CCP) National Congress on Saturday without explanation.
The CCP holds its National Congress session every five years to discuss the issues facing China and elects its Central Committee and other top politicians.
The meeting is traditionally well choreographed, but the video showed how Hu was suddenly removed from the meeting.
One man locked his arm with Hu before another appeared where Hu was sitting and led him out of the room, according to footage from AFP News Agency. Hu seemed to pull away from the man holding his arm at least once and said something to Chinese President Xi Jinping, who responded and nodded before leaving the room.
Hu was president of China and general secretary of the CCP for 10 years, before Xi.
Xi is elected for an unprecedented third term as president of the National Congress, making him the longest-serving president of China in history.
Presidents were previously limited to serving no more than two five-year terms, but Xi pushed for changes a few years ago that removed term limits from the Constitution.
CNN reported that Hu has been increasingly weak in public in recent years.