Malaysia's anti-corruption agency says it will appeal against the attorney general's decision to clear Prime Minister Najib Razak of criminal charges over a $681 million financial scandal.

The agency's move disrupts Najib's call to put to rest the scandal that has been the biggest political crisis in his seven-year premiership.

The attorney general said Tuesday that $681 million channeled into Najib's accounts in early 2013 was a personal donation from Saudi Arabia's royal family. He said Najib had returned $620 million. Based on the anti-corruption agency's investigation, he said he found no criminal wrongdoing.

The agency, however, said Wednesday it wanted an independent government panel to review the decision. The agency didn't say if it recommended charges against Najib.