An incident on the Sengkang LRT system on Monday evening was due to a pair of train-cars suddenly stalling and not a collision of the cars, said operator SBS Transit and regulator Land Transport Authority (LTA).

The sudden stalling of the train-cars, which were coupled together, may have caused passengers who were not holding on to any grab bars or standing poles to lose their balance, SBS and LTA added.

This "may have given the wrong impression that the trailing train-car had hit the one in front", they said in a joint statement yesterday.

A commuter had reported to citizen journalism website Stomp that a "collision" had taken place on the Sengkang LRT system at around 7pm on Monday. She also said several passengers fell because of the impact.

The Singapore Civil Defence Force told The Straits Times that its assistance was not required.

In yesterday's statement, SBS and LTA said a two-car train had stalled in between the Sengkang Town Centre and Renjong stations.

"SBS Transit staff subsequently reset the fault and manually drove the coupled train to Renjong station to detrain passengers safely," they said.