JEM mall remained closed on Thursday following the ceiling collapse, as shoppers wondered: Is the building safe?
The Jurong East shopping centre is likely to be shut for a week at most in the wake of Wednesday's accident, experts estimate.
Meanwhile, MP Ang Wei Neng said constituents were worried about potential hazards at Jem - which has already suffered two fires and had its opening delayed due to a lack of safety permits.
"I am concerned that there was some rush to open the mall," he said. "They may have taken some short cuts."
Shopper Manu Raji, 65, said: "I am scared to go into the mall.
How can the roof collapse? I will avoid it."
The accident happened just after 10pm, when a 50m by 4m portion of false ceiling collapsed due to a burst water pipe. Three people suffered minor injuries including bruises.
Jem said the centre would "remain closed until such time that the safety checks and tests and all rectification works are completed".
Consultants are checking the six-storey mall's water pipes for any other signs of leaks, and repair work to water-damaged lifts and escalators has begun.
The precautions were put in place after the Building and Construction Authority ordered the mall to close off the area and get an engineer to check all false ceilings and investigate the accident.
On Thursday, the authority released a statement confirming that a leaking pipe was to blame.
It said water had collected on the false ceiling, causing the collapse.