The People's Democratic Reform Committee (PDRC) will leave Lumpini Park after leader Suthep Thaugsuban's last speech on Sunday night as anti-government protesters shift their strategy in fighting to oust the caretaker government.

PDRC guards secure Santri Maitree Building at Government House being used as a PDRC command centre. (Photo by Patipat Janthong)

The PDRC has called for the presidents of the Constitutional, Supreme and Supreme Administrative courts, the Election Commission chairman and the Senate speaker to work out on a plan to set up an interim government.

But United Front for Democracy against Dictatorship (UDD) leader Jatuporn Prompan on Sunday rediculed the demand.

"The proposal of Mr Suthep is impossible because it will be opposed by the people," he said.

The UDD did not rule out a possible move closer to inner Bangkok from its rally site on Utthayan Road on the western outskirts of Bangkok.

The situation will dictate the decision, Mr Jatuporn said, confirming the pro-government movement's rally will not end until the political crisis is resolved and ''democracy is secured''.

The red shirts have stayed at Utthayan, better known by its former name Aksa Road, since Saturday. The road is in Thawi Wattana district of Bangkok and Phutthamonthon district of Nakhon Pathom.

The PDRC leader said all demonstrators will vacate the park by Monday to join other protesters at Government House and on Ratchadamnoen Avenue. The demonstrators will occupy Ratchadamnoen from Government House to Phan Fah Bridge.

The address at Lumpini on Sunday night will be the last before the move, he added.

Anti-government protesters walk pass the Rama VI statute as they leave Lumpini Park on Sunday for Ratchadamnoen Avenue. (Photo by Thanarak Khoonton)

A new main stage will be built near the United Nations office on Ratchadamnoen, according to Mr Suthep.

The move followed talks with his key leaders and the PDRC's allies, including Nitithorn Lamluea, a coordinator of the Network of Students and People for Reform of Thailand (NSPRT), and Samdin Lertbut, a Dhamma Army leader under Chamlong Srimuang.

The NSPRT will continue with its stage near Government House, Mr Suthep said.

The PDRC is using the Santi Maitree Building inside the Government House complex as its office.

Some protesters at Lumpini have already begun packing their belongings to move to the new sites, but most are waiting for Mr Suthep to take to the stage for the last time.

Protesters left all television stations on Sunday after spending two nights at the premises to put pressure on them to carry the PDRC's messages to the public.

Mr Suthep said the new venues will be used by the PDRC to celebrate its victory over the government on Monday.

Red-shirt supporters are in high spirits at their rally site on Utthayan Road on Saturday. (Photo by Pattarachai Prechapanich)

The PDRC has called for the presidents of the Constitutional, Supreme and Supreme Administrative courts, the Election Commission chairman and the Senate speaker to work out a plan to set up an interim government.

But United Front for Democracy against Dictatorship (UDD) leader Jatuporn Prompan on Sunday rediculed the demand.

''The proposal of Mr Suthep is impossible because it will be opposed by the people,'' he said.

The UDD did not rule out the possibility of moving closer to inner Bangkok from its rally site on Utthayan Road on the western outskirts of Bangkok.

The situation will dictate the decision, Mr Jatuporn said, confirming the pro-government movement's rally will not end until the political crisis is resolved and ''democracy is secured''.

The red shirts have been at Utthayan, better known by its former name of Aksa Road, since Saturday. The road is in Thawi Wattana district of Bangkok and Phutthamonthon district of Nakhon Pathom.