Thousands of protesters took to the streets of Bangkok to demand the resignation of Prime Minister Samak Sundaravej and his cabinet.
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BBC Website readers in Bangkok have been sending in their comments in response to the demonstrations.
I have been with the protest from the beginning. I'm a middle class businessman with a yearly income of $200,000. We came out to protest against the government who are trying to amend the law to protect the previous PM. We now want the whole government out.
This morning I was in Bangkok trying to make it to work. Unfortunately it seems that mobs of black-clad people made it impossible for tens of thousands of people to attend school or go to work. It's about high time that the courts jail these anti-democratic elements. The Thai King could end the protest within seconds, all he would have to say is that he was disturbed by these gangs using his colour, yellow.
This has been coming for a long time now. Thaksin has dragged Thailand through the mud and has completely split the country. The puppet PM (Samak) is widely disliked by the educated middle classes in Bangkok, but still has massive support from the rural poor. Vote buying and populist policies mean that the present government has managed to survive for so long. The protests could now turn violent, as Samak has given a "for us or against us" speech which has thrown petrol on the fire.
Employees at my company have been advised to go home early today as the political situation is not good. I certainly hope we are not heading for another military coup. That would be tremendously negative for the Thai economy.
I was happy to take part in the demonstrations today. The PAD in no way wants an end to democracy. The aim is to remove through peaceful means the corrupt Samak government. Any 'appointed' parliament will be a temporary measure until the present system can be improved.
As a British expat living here I passed by Government House which is basically under siege by the protestors. It's an incredibly dangerous situation which has pitted the entrenched political old guard against a democratically elected government. The real problem in Thailand is the way society is completely polarised. The government is part of a system that has tried somewhat to change that, much to the dislike of the PAD movement. Right now it seems the government has no power, and has become ineffective. If the police don't start doing there job, it will be only a matter of time before the military step in.
Democracy is not only about elections, especially when politicians use money to buy the vote from poor people and take over the country. The only thing Thaksin and Samak have done is abuse their power. Unfortunately a large number of Thai people are too poor and too hungry to think about anything further than their next meal. We all believe in democracy but we need to seek the right one that fits our nation.
Most Thai people dislike the gangs' behaviours. We have a democratic government elected by a majority of the people around the country. The gangs should respect the majority of the people and not try to create the social disorder.
The real problem is that Thaksin Shinawatra and the Thai government, during their rule, divided the Thai nation through sheer arrogance of its leader. This divide has been widened by the PPP government led by Samak as they are seen to be puppets of Thaksin. Both parties are perceived by a large percentage of the population to be extremely corrupt and unfit to govern. Samak has encouraged the PAD by his verbal abuse and ineptitude. The only way out is for Samak to resign and for a government of national unity to be formed so that the divisions created by the TRT/PPP can be healed. Only when this has been achieved, can proper elections be held for a truly representative and cooperative parliament.