PAD organisers have pinned their hopes on drawing their biggest crowd yet of up to a million people by staging the rally in Bangkok's major shopping district.

Another march is planned for today, beginning at Sanam Luang, but the organisers have yet to decide which route it will take and which government or public areas it will target.

Sondhi Limthongkul, a leader of the PAD which has organised the marathon rally to oust Thaksin, last night called on the public to join tomorrow's march along Sukhumvit Road.

He said the march would start at Supachalasai Stadium and pass a few giant shopping malls in the city, including Siam Paragon, Central World Plaza and The Emporium.

He said Thaksin's back was "against the wall" and he believed the premier would not survive until election day on April 2.

Sondhi said the PAD on Monday would file a police complaint for the arrest of Thaksin and the rest of his Cabinet. The PAD was holding them responsible for the botched privatisation of Egat, the electricity generating authority, which they opposed all along.

The PAD leaders have called for a massive anti-government rally today and are confident it will be the largest ever. They are keeping the details a secret about their destination as the authorities have been issuing warnings of a violent "end game" by the protesters.

The protest organisers have billed tomorrow's rally as the last major push to oust the embattled prime minister.

Chamlong Srimuang, another PAD leader, said the demonstrators would march from the protest site near Government House today.

He said the PAD's "decision makers", which include himself, had not yet revealed where they would direct the marchers.

He said the PAD leaders had agreed not to march near Chitralada Palace.

Suriyasai Katasila, the PAD spokesman, said the marches today and tomorrow might include the prime minister's house on Charan Sanitwong Road or various government offices.

Deputy Premier and Justice Minister Chidchai Vanasatidya, who is in charge of security affairs, yesterday said he had received intelligence reports that the protest organisers were planning to resort to violence in order to achieve their goal by today.

Chidchai said relevant agencies had been instructed to watch for possible reaction by a third party.

National Police spokesman Lt-General Ajiravid Subarnbhesaj said 10,000 police from outer provinces would assist 20,000 police in Bangkok to monitor the rally.

Prime Minister Thaksin, speaking after his return from a campaign rally in Udon Thani, said he would visit the motor show at an exhibition centre in the Bang Na area today.