BANGKOK, April 22: Pakistan's embassy in Thailand has received a letter from a mysterious group threatening terror attacks against countries supporting US-led operations in Iraq, Thai police said on Thursday.

The letter, matching a similar warning sent on Wednesday to South Korea's embassy, from a group calling itself the "Yellow-Red Overseas Organization," was received at the Pakistan mission on Monday, police said.

It threatened attacks on major facilities in Australia, Japan, Kuwait, Pakistan, the Philippines, Singapore, South Korea and Thailand between April 20 and 30. "The Pakistan embassy was the first to receive such a threatening letter, on April 19," a senior Special Branch police officer said.

"It was referred to the National Security Council for investigation, and later authorities found that the South Korean embassy received the letter on the 21st," he said. The threat came a week before Pakistan's Prime Minister Zafarullah Jamali was due to visit Thailand from April 28 to hold talks with his Thai counterpart Thaksin Shinawatra in Bangkok.

A Pakistani diplomat said he was unaware that the embassy had received any such threat. First Secretary Ryoo Jung-Young confirmed receipt of the letter at the South Korean embassy, and said Seoul immediately demanded greater security for the embassy and Koreans in Thailand.

Thai Foreign Minister Surakiart Sathirathai said necessary precautions had been taken after the letter was reported to authorities. -AFP