The driver of the tour bus which rammed into 10 vehicles near Menora Tunnel on Sunday was released on police bail today after expiry of his four-day remand.

District police chief ACP Sum Chang Keong said the 51-year-old driver could not be charged yet as police had not received the relevant report from the Computerised Vehicle Inspection Centre (Puspakom).

"We submitted the investigation paper to the deputy public prosecutor yesterday; when the Puspakom report is completed, we will refer the case to the DPP again," he told reporters after a 'High Profile Policing' at Tesco Pengkalan here today.

Sum said police had also recorded statements from the other vehicle owners and passengers in the bus.

Brake failure was believed to have caused the bus to ram into the 10 vehicles at KM265.8, North-South Expressway (PLUS) southward, around 2.45pm.

All 28 passengers in the bus and the driver, as well as occupants in the other vehicles escaped unhurt except for a 21-year-old woman who complained of abdominal pain.

The bus was found to have 63 outstanding summonses for various offences while the driver has nine outstanding summonses for various offences including speeding, between 2011 and 2015.