Details of the brutal killing of a father and son last Wednesday are expected to be released when police hold a press conference at 11am Saturday.

Late on Friday night, a 34-year-old man was arrested in connection with the murders that have made headlines and set the country talking - and speculating.

Hints that the suspect had fled to Malaysia after the killings came in a police press statement that was released at 2.27am Saturday.

The short statement announced the arrest and said it was "possible through the close collaboration between the Singapore Police Force and the Royal Malaysian Police".

The Singapore police also thanked its counterparts "for their unwavering support and assistance in this case".

The police had also shared the announcement of the arrest on its Facebook page.

The arrest at 11.30pm Friday came after Deputy Prime Minister and Home Affairs Minister Teo Chee Hean said no effort would be spared "to make sure that justice is served".

Car workshop owner Tan Boon Sin, 67, was killed in his 14J Hillside Drive terrace house in Upper Serangoon on Wednesday afternoon.

His older son, Mr Tan Chee Heong, 42, was seen staggering out of the house before collapsing in a pool of blood at about 3.40pm.

A few minutes later, someone drove the elder Mr Tan's Toyota Camry - with licence plate SGM 14J - out of the house, in the process running over the younger Mr Tan.

The body was dragged by the car for more than 1km before it was dislodged outside Kovan MRT station. The driver sped off.

Officers who went to the Kovan MRT station site discovered a trail of blood. It led all the back to the Hillside Drive house, where the father's body was discovered.

The abandoned car was found on Thursday morning in a quiet part of Eunos industrial estate. It was barely 1km away from where the elder Mr Tan's workshop was formerly located, before it moved to Kaki Bukit a few years ago.

A dispute, possibly over money matters, is believed to have led to the killings.