The move is aimed at removing any suspicions of interference by the Pheu Thai-led government in ongoing local investigations, said Sunai, who is chairman of the House Committee on Foreign Affairs.
The MP said he would use his own money to travel to the Dutch city and that red shirt supporters based in Europe would help him organise his legal bid.
Sunai said Prime Minister Abhisit Vejjajiva his then deputy, Suthep Thuagsuban, should be held accountable as they had overall responsibility for the crackdown.
Pheu Thai party-list MP Kattiyar Sawasdiphol, whose father Maj-General Kattiya Sawasdiphol was shot and killed by a sniper during the protests, said there has been no progress in the investigation of her father’s death and thus she is counting on the ICC to take up the case.
Thailand, however, is not among the ICC’s 119 member states, as it has yet to ratify the court’s Rome Statute.
Abhisit, now the opposition leader, said he is willing to cooperate with the Office of the Attorney General if he is summoned for questioning over the crackdown.