Singapore shares sank on Tuesday, tracking regional gains as investors showcased apprehensive behavior, backed by US Federal Reserve's statements that indicate an unlikelihood of any further interest rate cuts this year.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 4,413.98 and 4,450.41 throughout the day. It ended the session at 4,422.72, down 21.61 points or 0.49% compared to Monday's close.

Sembcorp Ind, CapLand India T down over 3%; YZJ Shipbldg, SIA Engineering, Kep Infra Tr down over 2%; YZJ Fin Hldg, Sats, ST Engineering down over 1%.

In company news, shares of GS Holdings were up over 4% at the close as it agreed to acquire Dyspatchr, a Singapore-based local F&B importer and distributor, for SG$1.5 million.

Keppel was down nearly 2% even after along with its partners, the company closed the acquisition of the remaining 49% stake they do not own in Cleantech Renewable Assets from Shell Singapore.

Meanwhile, NetLink NBN Trust's shares were down nearly 1% after its attributable profit to unitholders declined 10% during fiscal first half of the year ended Sept. 30 to SG$43.5 million from SG$48.5 million a year earlier.