The Australian Federal Police failed to act quickly on the alleged corruption inside the Reserve Bank's currency subsidiary.

The police are currently probing Securency International on claims that it paid millions of dollars in commissions to overseas middlemen to secure bids and contracts for note printings.

According to AFP, the allegations include the Security International and its sister company, Printing Australia, paying more than $50 million in bribes to get note printing contracts.

At a Senate Committee hearing on Tuesday, Greens Senator Bob Brown expressed his frustration that AFP's investigation is too slow and urged the senate for a public inquiry.

Senator Brown also probed AFP Commissioner Tony Negus if statements regarding its failed response to the alleged corruption reported by a Securency employee back in April 2008 were correct.

Mr. Negus, in his defense, said there were already initial assessments to the claims during the period when the alleged act was reported and it was later found that it lacked material to start an investigation.

The AFP commission promises that they will continue to pursue the investigation and have deployed full-time 20 investigators around the world.

Commissioner Negus did not confirm on the partial results of the investigations, however, they collaborated with the Serious Fraud office in the United Kingdom for more assistance.

Meanwhile, Senator Brown said that government officials from Vietnam, Indonesia, Nigeria, Nepal, South Africa, and Cambodia, may be included in the alleged corruption.