A major Thai hospital evacuated patients and suspended all but emergency surgery on Friday after anti-government protesters stormed in to hunt for security forces they suspected were taking positions there overlooking their barricaded enclave.

A group of the so-called Red Shirts broke into Chulalongkorn Hospital late Thursday despite pleas from its director, then withdrew after not finding soldiers or police within the sprawling compound.

Prime Minister Abhisit Vejjajiva, whom the protesters seek to overthrow, went on nationwide television to criticise recent Red Shirt actions that have paralysed areas of central Bangkok.

The Red Shirts, drawn mostly from the rural and urban poor, are demanding dissolution of Parliament and new elections, saying Mr. Abhisit came to power through the connivance of Bangkok’s elite bureaucrats and the military, which ousted their hero — ex-Prime Minister Thaksin Shinawatra — in a 2006 coup.

“It’s not necessary for me to condemn (the hospital break-in) since Thai society and the world community have already done that,” Mr. Abhisit said, adding that the government would “not allow any movements that pose threats to the public.”

Despite such warnings, the Red Shirts have defied authorities at every turn, entering the Parliament building, laying siege to a telecommunications complex, blocking roads and staging mass motorised rallies since setting up camp in the capital March 12. At least 27 people have died and nearly 1,000 have been injured in outbreaks of street violence.

Security forces have in almost every instance been unable or unwilling to stop the Red Shirt forays, including the incursion into the century-old public hospital, which feared a second break-in Friday.

However, Weng Tojirakarn, a Red Shirt leader and medical doctor, issued a “deep apology” for the raid staged by up to 100 protesters. He called it “inappropriate, too much, and unreasonable.”

Later, the protesters opened up a section of their barricade to allow vehicles access to one of the entrances to the Chulalongkorn Hospital compound.

It was not clear whether Mr. Weng apologised because of the sharp negative reaction, or whether the foray was staged by some of the more radical Red Shirts rather than by general consensus.

About 100 police were sent to guard the hospital grounds.

“They can protest all they want but they should not come here, and they should not have prevented us from receiving service,” said an angry Purin Supadith, one of many being turned away at the hospital’s outpatient department on Friday morning.

In the face of such incidents, Thai pro-establishment activists have demanded military action against the protesters and an end to “anarchy” in the capital.

The re-emergence of the so-called Yellow Shirts — notorious for shutting Bangkok’s airports for a week in 2008 — added to the volatility on the streets of Bangkok.

The unrest is the result of a political standoff over the 2006 military coup that Mr. Thaksin on corruption allegations.

The crisis has hurt business in the capital and devastated Thailand’s vital tourist industry, which accounts for 6 per cent of the economy.

But Finance Minister Korn Chatikavanij said on Friday the economy as a whole is still faring well, with high foreign exchange reserves.

“The Thai economy is showing great resilience. So I think we can survive this. We’ll have no problem staging a quick and immediate rebound,” Mr. Korn said.

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