SINGAPORE, May 25 -- Singapore's Immigration and Checkpoints Authority (ICA) said it will carry out a safety review after a car and bus collided at Woodlands Checkpoint early yesterday morning in an accident it said "should not have happened".

The crash occurred at 5.28am when a departing Singapore-registered car collided with an arriving Malaysia-registered bus on the Causeway, with ICA confirming that the contraflow operation had been activated before safety barriers were set up.

"This accident should not have happened. ICA is treating it very seriously, and we are assisting the Traffic Police who are investigating the accident," CNA cited the agency saying.

Singapore police said the car driver, a 48-year-old man, and his three passe...