SINGAPORE - Two elderly people died following an accident involving a minibus they were in, a lorry and a tow truck.

They died of their injuries at Changi General Hospital (CGH) after the accident on the Pan-Island Expressway (PIE) on Monday morning. Both were on wheelchairs at the back of the minibus.

Another elderly passenger is in the intensive care unit, said a CGH spokesman.

It is believed that the trio were returning home after treatment at St Andrew's Community Hospital in Simei when the accident happened.

Police said on Tuesday that they were alerted to the accident at about 10.55am. It happened along the PIE in the direction of Tuas near the Tampines exit. Four passengers in the minibus and a male driver were sent to CGH. The Singapore Civil Defence Force said it sent two fire engines, two fire bikes and four ambulances to the scene.

According to The New Paper, the tow truck was there to move the truck when the accident happened. The front of the minibus was crushed after it collided with the side of the tow truck.

The minibus driver, who is in his 50s, has been discharged. Another female passenger, in her 30s, who works as a helper for one of the two who died, remains warded.

Police investigations are ongoing.