Thousands of the anti-government protestors from several provinces, particularly from the North East region, have arrived at the main rally site at the Pan Fah Bridge from Saturday afternoon.

The Pan Fah Bridge is located on Ratchadamnoen Road in the center of Thailand's capital Bangkok as the UDD political demand includes resignation of the coalition government or the House dissolution paving the way for a new general election.

Joint police and military personnel have been strictly safeguarding Ratchadamnoen Road as a stage and tents have been set up along the road by the UDD demonstrators, the National News Bureau of Thailand (NNT) under the state-owned Public Relations Department, reported.

Earlier in the morning Police Major General Tanapol Sontade, commandant of the 191 observation and special operation, led a bomb detection and disposal squad to examine the area on the Pan Fah Bridge.

Police Major General Tanapol said his team would also pass on the inspection task to the UDD people when they arrive at the bridge.

Thailand's weekly cabinet Tuesday decided to impose the Internal Security Act (ISA) in eight provinces during March 11-23 to ensure law and order during the rally by the anti-government United front for Democracy against Dictatorship (UDD) group.

Of the total eight provinces, the ISA imposition has been enforced in the whole area of capital Bangkok and Nonthaburi, which is next to Bangkok, while it is imposed in some 21 districts of the six other provinces nearby Bangkok, including Pathum Thani, Samut Prakan, Samut Sakhon, Chachoengsao, Nakhon Pathom, and Ayutthaya.

Totally, under the ISA law's enforcement there are 50,000 security men, who will maintain security during the mass rally.