The two suspects in the Sheng Siong kidnap case have been remanded for further investigation.

The prosecution told the court this morning that investigation was incomplete and applied for Lee Sze Yong, 41, and Heng Chen Boon, 50, to be remanded for another week.

Lee, an odd-job worker, is accused of abducting Madam Ng Lye Poh, 79, the mother of Sheng Siong supermarket boss Lim Hock Chee.

He allegedly did so between 10.30am and 1.02pm last Wednesday along Hougang Avenue 2, with the intent to hold her for ransom.

Credit card promoter Heng allegedly helped Lee confine her in a vehicle near Sembawang Park between 8.30pm and midnight that day.

Appearing in court this morning, Heng turned to look at the public gallery thrice to see if he could spot familiar faces.

Madam Ng was kidnapped after her daily visit to the market. She was freed unhurt early a day later, after her son dropped off a $2 million ransom at Sembawang Park.

Mr Lim, founder of the Sheng Siong supermarket chain, has a net worth of US$515 million (S$655 million).

If convicted, the pair could be hanged or jailed for life. Lee also faces caning.

They will be back in court next Friday.