The multi-billion scandal at 1MDB dogged Najib and his family in the last three years of his near-decade-long rule, and was a key reason for his shock defeat in a May 9 election.

Najib has already made a series of statements to anti-graft investigators. Attention has shifted to his wife, Rosmah Mansor, after police found hundreds of luxury handbags, jewelry and cash during raids on apartments linked to the family.

Rosmah arrived in a convoy of four private cars at the headquarters of the Malaysian Anti-Corruption Commission (MACC).

Flanked by security guards and her lawyers, she stepped out of a silver Mercedes carrying a bright red handbag that appeared to be a model made by Italian luxury fashion brand Versace.

Rosmah walked through a throng of journalists waiting for her arrival and was accompanied by her daughter Nooryana Najwa.

Rosmah is expected to give her statement to anti-graft investigators in connection with a suspicious transfer of about $10.6 million into Najib's personal bank account that has been traced to the former 1MDB unit SRC International.

The sum is just a fraction of the billions of dollars allegedly siphoned from 1MDB, the state fund that Najib set up.

He has denied any wrongdoing and was cleared of any offence in an earlier Malaysian enquiry.

Earlier on Tuesday, some lawyers representing Najib and Rosmah on the SRC case said they had quit.

M. Puravalen, a lawyer acting for Najib and Rosmah in connection with the SRC investigations, told Reuters on Tuesday he had "ceased acting" for Najib and Rosmah.

He said a second lawyer, Yusof Zainal Abideen, had also quit. News site The Malaysian Insight reported that Puravalen, Abideen and other members of their legal team had walked out because they failed to reach common ground with Najib on several issues.

Abideen could not be reached immediately reached for comment. Najib and Rosmah could also not be reached for comment.

In raids over the past weeks, police have seized 114 million ringgit ($28.6 million) in cash and more than 400 handbags. Experts were being brought in to value the jewelry, watches and other seized items.

Najib and Rosmah have been barred from leaving the country and enforcement agencies have relaunched a probe into how the 1MDB funds went missing.

1MDB is also the subject of money-laundering probes in at least six countries, including the United States, Switzerland and Singapore.

REUTERS