BANGKOK, Thailand (AP) – The army commander who seized Thailand’s government in a quick, bloodless coup pledged Wednesday to hold elections by October 2007, and received a ringing endorsement from the country’s revered king.

Gen. Sondhi Boonyaratkalin also hinted that ousted Prime Minister Thaksin may face prosecution.

General Sondhi said he would act as prime minister for two weeks until a new leader is chosen by the Council of Administrative Reform, that an interim constitution would be drafted within that time, and that Thailand’s foreign policy and international agreements would remain unchanged.

The Bush administration denounced the coup, saying it was a “step backward for democracy.” Australia called it a “great disappointment,” and the European Union also condemned it.

King Bhumibol Adulyadej appointed General Sondhi as head of the council “in order to create peace in the country,” according to an announcement on state-run television.

“All people should remain peaceful and civil servants should listen to orders from Gen. Sondhi Boonyaratkalin from now on,” it said.

General Sondhi led a precision takeover without firing a shot, sending soldiers and tanks to guard major intersections and surround government buildings while the popularly elected Mr. Thaksin, accused of corruption and undermining democratic institutions, was in New York attending the U.N. General Assembly.

Asked at a news conference if there would be moves to confiscate Mr. Thaksin’s vast assets, General Sondhi said that “those who have committed wrongdoings have to be prosecuted according to the law.” He did not elaborate.

In launching Thailand’s first coup in 15 years, General Sondhi said on nationwide television that the overthrow was needed “in order to resolve the conflict and bring back normalcy and harmony among people.”

“I am the one who decided to stage the coup. No one supported me,” he said.

General Sondhi, 59, known to be close to the king, is a Muslim in a Buddhist-dominated nation.

State-run television also said the new leaders had dismissed the state audit commissioners and given additional powers to the auditor general Jaruvan Maintaka to investigative government corruption. Analysts said the move is expected to make it easier for Jaruvan to investigate allegations of corruption involving Thaksin and his ministers and could eventually lead to the confiscation of his assets.

Mr. Thaksin arrived Wednesday in London on a private visit. A chartered Thai Airways jet landed at Gatwick Airport at 5:35 p.m. London time (12:35 p.m. EDT), the airport’s press office said.

A British government spokesman said Mr. Thaksin had no meetings scheduled with Prime Minister Blair or other officials.

In New York, a Thai business executive who said he was speaking on behalf of Mr. Thaksin said the toppled leader was not resigned to his fate.

“The prime minister has not given up his power,” said Tom Kruesopon, chief executive officer of Boon Rawd Trading International Co., who said he was traveling with Mr. Thaksin.

But Mr. Thaksin’s official government spokesman, Surapong Suebwonglee, also traveling with him, was gloomier. “We have to accept what happened,” he said. “We are not coming back soon.”

Bangkok, a city of more than 10 million, was calm Wednesday. Most stores were open and residents appeared unfazed, with traffic running as normal and the tanks becoming popular tourist attractions.

About 500 people gathered outside army headquarters to lend moral support to the military, chanting “Thaksin get out!”

But in the first sign of anti-coup sentiment, Thaksin supporters faced off with rival groups celebrating the coup at two separate gatherings in Bangkok. Soldiers intervened, narrowly averting clashes.

The council put the country under martial law and declared a provisional authority loyal to the king, seizing television and radio stations and ordering government offices, banks, schools and the stock market to close for the day.

The unexpected coup rattled Asian financial markets. Thai central bank head Pridiyathorn Devakula said the coup was unlikely to have much impact on investor confidence and that the Thai baht had recovered from an overnight low without intervention.

Nearly 20 tanks – their machine gun barrels festooned with ribbons in the royal color of yellow – had blocked off the Royal Palace, Royal Plaza, army headquarters and Thaksin’s office at Government House.

In the afternoon, the tanks began shifting from positions in downtown Bangkok. It was not immediately clear whether the tanks were withdrawing, or merely changing positions. Government public relations officials said they could not immediately comment.

The Nation newspaper in Bangkok said several senior government officials and others close to Mr. Thaksin had been arrested, their fates unknown.

It said they included Deputy Prime Minister Wannasathit and Mr. Thaksin’s top aide Prommin Lertsuridej.

Agriculture Minister Sudarat Keyuraphan, one of Mr. Thaksin’s closest political associates, fled to Paris with her family, it said.

In Washington, State Department said there was “no justification” for the coup.

“We are disappointed by this action,” deputy spokesman Tom Casey said. “It is a step backward for democracy.”

White House spokesman Tony Snow also registered disappointment. “We hope those who mounted it make good and make good swiftly on their (promise) to restore democracy,” Snow said as President Bush returned to Washington from a speech and meetings at the United Nations.

Prime Minister Howard described the coup as a “great disappointment,” adding that it was a reminder of an element of Asia’s past he had hoped would not return. “We condemn military coups,” Mr. Howard said. “They are a throwback to a past I had hoped Asia had emerged from.”

Japan also called for the quick restoration of democracy in a country where many of its top businesses have factories and affiliates.

The European Union joined condemnation of the coup and said “the military forces stand back and give way to the democratically elected political government.”

China described the coup as “an internal affair of Thailand” and made no public judgment. “The friendly relations between China and Thailand will continue to develop,” Chinese Foreign Ministry spokesman Qin Gang said.

The International Monetary Fund, which bailed Thailand and some of its neighbors out of a financial crisis in the late 1990s, was closely watching the situation but believed the region would be little affected, said the IMF’s chief, Rodrigo de Rato.

“Thailand’s economy is fundamentally strong,” Mr. de Rato said.

The American Embassy, in an e-mail to its citizens living in Thailand, said while there had been no reports of violence, Americans should “monitor the situation closely, avoid any large gatherings and exercise discretion when moving about the city.”

“At this point, we are not advising Americans to leave Thailand; however, Americans planning to travel to Thailand may wish to carefully consider their options before traveling until the situation becomes clearer,” the e-mail read.

Britain told its citizens in Thailand to stay in their homes, while Japan, Australia and Canada similarly advised caution.

Mr. Thaksin, a telecommunications tycoon, handily won three general elections since coming to power in 2001 and enjoyed great support among the rural poor for his populist policies.

But he alienated the urban middle class, intellectuals and pro-democracy activists. They began mass street demonstrations last year, charging him with abuse of power, corruption and emasculation of democratic institutions, including media that were once among Asia’s freest.

The bloodless coup was the first overt military intervention in Thailand since 1991, when Suchinda Kraprayoon, a general, toppled a civilian government in a bloodless takeover. He was ousted in 1992 following street demonstrations.