Singapore's shares plunged on Tuesday as China and Canada imposed reactionary tariffs on US with the latter vowing to impose 25% tariffs on $150 billion worth of US imports, while Beijing also added various US firms to its unreliable entity list.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 3,890.52 and 3,904.15 throughout the day. It ended the session at 3,890.76, down 18.16 points or 0.46% compared to Monday's close.

In economic news, Singapore's factory activity expanded at a slower pace in February, with the Purchasing Managers' Index (PMI) easing to 50.7 from 50.9 in January, marking the lowest level in seven months, according to data from the Singapore Institute of Purchasing and Materials Management (SIPMM).

In company news, AEM Holdings (SGX:AWX) was down over 2% after it awarded 33,783 shares pursuant to its restricted shares plan at a market price of SG$1.48 per share.

A-Sonic Aerospace (SGX: BTJ) revealed that it is looking to dispose of its leasehold property located at International Plaza, Singapore.

Meanwhile, CH Offshore (SGX:C13) proposed to undertake a renounceable non-underwritten rights issue of up to 1,409,785,028 new shares in the company's capital at SG$0.01 per right share.