Officers from the Immigration and Checkpoints Authority (ICA) discovered more than 1,000 cartons and over 400 packets of duty-unpaid cigarettes in total in two separate incidents last Thursday.

At around 5.45pm, officers at Woodlands Checkpoint saw anomalies in scanned images of a Malaysia-registered lorry, which was not supposed to be carrying any goods.

They discovered 961 cartons and 117 packets of duty-unpaid cigarettes hidden in the roof panels of the lorry, which was entering Singapore at the time.

Soon afterwards, at 7.15pm, officers found 119 cartons and 298 packets of duty-unpaid cigarettes hidden in the rear undercarriage and door panel of a Malaysia-registered car. It was also entering Singapore at the time.

Singapore Customs is investigating both cases.

In a statement on its Facebook page, the ICA said: "The ICA will continue to conduct security checks on passengers and vehicles to prevent any attempts to smuggle in undesirable persons, drugs, weapons, explosives and other contraband."