The demonstrators were angry at the government's decision to close down the channel, which the authorities have accused of inciting violence.
In defiance of emergency law, the red-shirts seized control of a building in the ThaiCom compound, intent on restoring the signal of the People Channel (PTV), which has proved an effective tool in drawing thousands of extra protesters into Bangkok.
The security forces tried to defend the compound, using first water cannon then tear gas but were eventually driven into retreat by the protesters.
Many rural dwellers and urban poor support red-shirts, while yellow-shirts comprise mainly middle classes and urban elite
In September 2008 yellows rally against government, reds counter-rally, clashes in Bangkok
Yellows blockade airport in November 2008, government collapses, yellow-friendly government installed
In April 2009 red protests halt Asean summit, two people die in Bangkok clashes, rallies called off
Reds relaunch protests in March 2010, splash blood on government buildings, march on parliament
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