The Bera MP arrived at the MACC headquarters here at 9.52am and left at 4.30pm without lowering his window to speak to reporters.

A MACC source said the agency has yet to wrap up its investigation and still requires the assistance of the ninth prime minister

Ismail is expected to return to the MACC headquarters at 10am tomorrow for a fifth day of questioning.

The former Umno vice-president is being questioned as a suspect in a corruption and money laundering investigation into four of his former officers.

MACC previously said that about RM170 million in cash and 16kg of gold bars worth millions of ringgit had been seized in raids at the residences of the four officers, and three other premises believed to be “safe houses”.

Ismail, who collapsed at home on Feb 22 and was hospitalised for blood pressure-related problems, could not attend two previously scheduled sessions with MACC on March 5 and 7 after being issued medical certificates by his doctor.

He declared his assets to MACC on Feb 10.