Former Malaysian Prime Minister Najib Razak leaves Malaysian Anti-Corruption Commission (MACC) headquarters in Putrajaya, Malaysia, May 24, 2018. Investigators questioned former Malaysian Prime Minister Najib Razak for more than six hours at the headquarters of the Malaysian Anti-Corruption Commission (MACC) on Thursday and let him go home as the probe related to the state development fund 1MDB continues. (Xinhua/Chong Voon Chung)

PUTRAJAYA, Malaysia, May 24 (Xinhua) -- Investigators questioned former Malaysian Prime Minister Najib Razak for more than six hours at the headquarters of the Malaysian Anti-Corruption Commission (MACC) on Thursday and let him go home as the probe related to the state development fund 1MDB continues.

Najib arrived at MACC at around 9:45 a.m. local time. Wearing a black suit and sporting a smile, a relaxed Najib waved to the media before entering the building. He walked out of the building at around 4:50 p.m. local time.

Najib told the media outside that he has finished recording his statement.

Najib's presence was the continuation of the first round of questioning on Tuesday, when he was asked to explain the connection between a 42-million-ringgit (10.55 million U.S. dollars) deposit into his personal bank account and SRC International, a former subsidiary of 1MDB.

The Malaysian finance ministry said in a statement on Wednesday that directors of 1MDB have conceded that the firm is insolvent and its 9.8 billion ringgit investments are "a scam."

The finance ministry said it has picked PricewaterhouseCoopers to audit the financial position of 1MDB.

The police, meanwhile, conducted search on several premises related to Najib where a trove of cash, designer handbags and jewelry were found.

Najib has denied any wrongdoing. In a statement issued before the questioning, Najib accused the new government of mixing "political narrative" with "facts" and asked it to stop playing politics.