Malaysia's attorney general has defended the government over a debt scandal as the country's state rulers push for the investigation to be resolved quickly.

The Conference of Rulers, which comprised nine state rulers and governors of four other states, issued a rare statement Tuesday calling for a quick and transparent investigation into the 1MDB investment fund.

The fund set up by Prime Minister Najib Razak in 2009 to develop new industries has accumulated at least 42 billion ringgit ($10 billion) in debt.

The Attorney-General's Chambers says it studied the central bank's investigation report into 1MDB and found no wrongdoing by fund officials.

It said Thursday that the police and the anti-corruption agency were still investigating.