SINGAPORE - A faulty mechanical ventilation blower was the source of "white smoke" at Toa Payoh MRT station on Saturday (Oct 7) morning, said the Singapore Civil Defence Force.

In a Facebook post, the SCDF said the blower was in an air handling unit room of the Toa Payoh Hub. It has since been shut off and service technicians are working to rectify the fault, it added.

In response to queries from The Straits Times, SBS Transit said investigations showed that a mechanical component in the air blower was defective. It added that works were underway to replace it.

"During the incident, our contingency plan was activated. This included directing commuters away from the affected area where two boarding berths are located. We also guided commuters to board affected services at the first bus stop outside the Interchange," said Ms Tammy Tan, SBS Transit's senior vice-president of corporate communications. She added that no injuries were involved.

Earlier, the SCDF said it was investigating an incident involving "white smoke" at Toa Payoh MRT station, after it was alerted to it at 9.22am.

At around 10.30am, SCDF said in a Facebook post that the smoke had dissipated and that there were no reported injuries.

MRT and bus services were not affected, added SCDF.

The Straits Times understands that the room where the smoke originated is under the purview of SBS Transit, which manages the Toa Payoh integrated transport hub.