PUTRAJAYA, Aug 5 — The police are currently raiding the Malaysian Anti-Corruption Commission’s (MACC) Special Operations Division, fresh after interrogating three senior graftbusters today over the alleged leak of documents on the 1Malaysia Development Berhad (1MDB) probe.

The police arrived at the MACC headquarters here at 7.15pm and escorted the officers, who had just returned from being questioned at the Putrajaya district police headquarters, into the office for the raid.

It is uncertain, however, as to what the police are looking for. There is heavy media presence outside the MACC headquarters here.

It is understood that two of the division’s officers have also been detained.

One of those arrested is believed to be an officer directly involved in the investigation on SRC International, a former subsidiary 1Malaysia Development Bhd (1MDB).

This is the second raid conducted on the agency’s headquarters since last week.

“We are not sure what they are looking for but we were notified of the planned raid when our officers were questioned,” said one MACC media officer who requested anonymity.

Prior to the raid, the division’s deputy director and two others were questioned earlier this evening for almost four hours by the police in relation to the agency’s leaked investigation papers on the US$700 million (RM2.6 billion) that was deposited into Prime Minister Datuk Seri Najib Razak’s personal account.

The police were unavailable for comment.

It is also unclear if the two MACC officers will be remanded for questioning.

According to a July 2 report by the Wall Street Journal, which cited the leaked documents as proof, one portion of the funds was funnelled into Najib’s Ambank account through SRC International.

MACC had on Monday issued a statement to confirm the existence of the funds in Najib’s accounts and clarify that they had come from donors and not 1MDB as previously alleged.

The statement triggered a flurry of responses from activists and opposition lawmakers, who demanded that the commission investigate the donation for possible corruption and money-laundering.

The commission and Najib himself have also been urged to reveal the identities of the donors and the purpose of the funds.

It was previously alleged that the funds were used for Barisan Nasional’s (BN) Election 2013 campaigns but detractors have pointed out that this would be illegal as RM2.6 billion far surpasses the legal limit allowed by Malaysia’s election laws.