PUTRAJAYA: Former prime minister Datuk Seri Najib Abdul Razak was summoned again today by the Malaysian Anti-Corruption Commission (MACC) for questioning over a new probe on offences related to the 1Malaysia Development Berhad (1MDB) scandal. Sources said Najib arrived at the MACC headquarters here at 10am before he met with investigators for the questioning session on new developments in the case. About two weeks ago, he was called up by the commission for a similar session before he was detained overnight and charged in court on Oct 4. Najib has vehemently denied the funds are from 1MDB, insisting the RM2.6 billion which he received in his personal bank account was a political donation from Saudi Prince Abdul Aziz Al-Saud on behalf of Saudi King Abdullah Abdul Aziz in 2011 and 2012 and meant for use for the 13th general elections in 2013 . Since July, Najib was arrested thrice on separate occasions and slapped with multiple charges for money laundering and power abuse over the 1MDB scandal and another involving its subsidiary company SRC International Sdn Bhd. He claimed trial to all the charges. The defeat of Barisan Nasional in the 14th General Election spelled trouble for Najib when barely a week after the new government took over the administration of the country, investigations on the multi-billion ringgit scandal were ordered to resume in full scale. Dozens of raids were conducted by the police and MACC including at Najib's house, three condominium units at the Pavilion Residences and other premises linked to the scandal.