The reports sparked an outcry from governments across Asia, with officials calling on the U.S. and its allies to explain themselves. The embassy spying allegations follow other reports that the U.S. has spied on the telephone communications of as many as 35 foreign leaders.
"China is severely concerned about the reports, and demands a clarification and explanation," Chinese Foreign Ministry spokeswoman Hua Chunying said Thursday.
Indonesian Foreign Minister Marty Natalegawa said Friday the allegations were deeply concerning and unacceptable.
"Countries may have capacities, technical capacities, to intercept and to carry out the activity that's been reported, and information may have been gathered," he told reporters in Perth, Australia, where he is attending a conference. "But the cost in terms of trust, in terms of the damage that may be resulting, is something that we must all reflect on."
According to the Snowden document, the spying sites are small in size and staff. "They are covert, and their true mission is not known by the majority of the diplomatic staff at the facility where they are assigned," it said. The surveillance equipment is concealed, including antennas that are "sometimes hidden in false architectural features or roof maintenance sheds," the document said.
Australian Prime Minister Tony Abbott said only that the government had not broken any laws.
Still, there was predictable outrage in the countries named in the document.
Malaysian Home Minister Ahmad Zahid Hamidi said his government viewed the allegations as a serious matter and would investigate whether the U.S. Embassy in Kuala Lumpur was being used for spying. The country's opposition party issued a statement Thursday urging the Malaysian government to lodge a protest with both the U.S. and Australian embassies.
Thailand's National Security Council Secretary-General, Lt. Gen. Paradorn Pattanathabutr, said the government told the U.S. that spying was a crime under Thai laws, and that Thailand would not cooperate if asked to help eavesdrop.
Asked about the Australian embassy allegations, he said Australians are not capable of doing such sophisticated surveillance work.
"When it comes to technology and mechanics, the U.S. is more resourceful and more advanced than Australia," he said. "So I can say that it is not true that the Australian embassy will be used as a communications hub for spying."
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Associated Press writers Thanyarat Doksone in Bangkok, Niniek Karmini in Jakarta, Sean Yoong in Kuala Lumpur and researcher Zhao Liang in Beijing contributed to this report.