Prime Minister Surayud Chulanont said his government will issue state of emergency in case the situation at Sanam Luang rally is out of control.

"I am ready to declare state of emergency if we could not control the situation," he said.

He was speaking after chairing an urgent meeting of security authorities to prepare for the pro-Thaksin rally at Sanam Luang on Friday.

Attending the meeting included Council of National Security's chief Gen Sonthi Bunyaratglin, National police chief Pol Gen Seripisut Temiyavej.

Many worried about the escalation of situation now that exiled prime minister Thaksin Shinawatra is scheduled to give a televised address from London to the demonstrators.

Surayud told reporters that there would definitely no blocking of air signals of Thaksin because Thaksin has rights to do so as long as his speech was not considered instigating violence.

"We will do anything according to the laws as well as freedom of expression. We wish that other people would abide by the same principles," he said.

He insisted that the security authorities overseeing the situation will not be armed.