Singapore stocks opened lower on Tuesday as the latest round of attacks between the US and Iran sent oil prices higher, hurting investor sentiment.

The Straits Times Index slid 0.4%, or by 23.39 points, to open at 5,446.95.

On Monday, the US carried out a third consecutive night of strikes against Iran to "degrade their ability to attack innocent civilians and commercial shipping in the Strait of Hormuz," the U.S. Central Command said in an X post.

Investors are also eyeing US inflation data on Tuesday and subsequent policy signals from the Federal Reserve.