Kuwait's prime minister has hit back at allegations of corruption made by a leading opposition figure who says he has documents proving billions of dollars in illicit transfers were made to senior officials, including judges.

Jaber Al-Mubarak says Musallam al-Barrack's documents are of no value and do not pass examination. Al-Mubarak was quoted in local newspapers Wednesday making the remarks to members of Kuwait's parliament, who called for a discussion of the documents.

The Finance Minister was also quoted saying the documents are difficult to authenticate because they lack important details.

Kuwait's Supreme Judicial Council ordered an inquiry into the "lies and fabrications" made by al-Barrack, who revealed the documents to more than 6,000 protesters late Tuesday. His opposition group had called for the anti-corruption rally in the Gulf monarchy.