They left their protest site near Government House in the morning in a convoy of vehicles.
Their first stop was the Chinese embassy on Ratchadapisek Road. The protesters submitted a letter to the Chinese ambassador, saying that some groups of Thai people had thought about separating from Thailand to set up a new state.
The letter also told the embassy of the damage caused by the "Thaksin regime", saying it was the most corrupt in world history, particularly from the rice-pledging scheme.
It accused the Thaksin regime of violence by using an unidentified force agains the protesters, of having caused division and ruined the country's economy with populist policies.
The NSPRT made the British embassy the second stop.
At the United States embassy, the third point of visit, the protesters were told of a regulation which prohibits them taking photographs. The embassy also said it would allow only two representatives inside to submit the letter.
After about 30 minutes of negotiations, the US embassy stood firm to its regulation, causing NSPRT leader Nitithorn Lamlua to tear up the letter, accusing the US of being undemocratic and siding with the Thaksin regime.
The protesters moved on to the Japanese embassy, where their letter was received by embassy officials.
The NSPRT reportedly planned to also visit the French, Russian and German embassies as well as offices of foreign news agencies.