December 22, 2013 -- Updated 1651 GMT (0051 HKT) Thai anti-government protesters wave national flags as they rally in Bangkok on December 22. NEW: Protest leader calls for demonstration at site where election candidates will register Protesters surrounded the home of Prime Minister Yingluck Shinawatra An estimated 90,000 protesters were marching in Bangkok, Lt. Gen. Paradon Patthanathabut, Thailand's national security chief, told CNN. He said that number rose to 150,000 at the peak of the rally in the late afternoon. He earlier said 10,000 had surrounded the premier's home while she tours the northeast provinces. The demonstration there was later disbanded. Speaking on one of the main stages set up at the rally, protest leader Suthep Thaugsuban asked demonstrators to surround a sports complex where candidates seeking to put themselves forward for the election will have to register their names. Candidates have from Monday to Friday to do so. Security beefed up Security at the complex was being stepped up ahead of the start of registration, Paradon said, but he could not give figures.