SINGAPORE - Sixteen passengers suffered minor injuries when an SBS Transit double-decker bus crashed into the back of another in Pasir Ris on Sunday (April 17) afternoon.

A Singapore Civil Defence Force (SCDF) spokesman said it was alerted to the accident along Pasir Ris Drive 1 - in front of Block 516 - at around 3.40pm.

All 16 were conveyed conscious to Changi General Hospital in two ambulances and a support vehicle, the spokesman added.

The Straits Times understands that it was SBS Transit service 109 that collided with the rear of service 81.

In response to queries, Ms Tammy Tan, SBS Transit's senior vice-president of corporate communications, said officers were at the hospital to "show care and concern" to the injured passengers.

"We are relieved to know that all of them received outpatient treatment and are rendering them assistance as best we can. We apologise to affected commuters for the distress and inconvenience caused. Meanwhile, we are investigating the incident," she added.

Administration executive Judy Ng, 32, posted several photos of the accident, which showed both buses bumper to bumper on the left-most lane of the road.

SCDF paramedics were also seen tending to the injured on the pavement.

Ms Ng said she was cooking in her flat's kitchen when she heard a loud bang. "The front windows of service 109 were all smashed, and there was what looked like black oil seeping out from underneath the buses," she added.

Police investigations are ongoing.

Correction note: An earlier version of this article said that 17 passengers were hurt, based on information provided by SCDF. SBS Transit has clarified that the correct number was 16.