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Stompers Shaju, Catherine and Ken sent in videos and photos of the incident to Stomp via WhatsApp showing smoke emitting out of one of the trains and permeating the station as well.
Passengers are seen exiting the train but there was no air of panic and everyone seems calm.
Here is the SMRT post in full:
"At 2:53pm this afternoon, passengers at Tanjong Pagar MRT station were detrained from a westbound train due to a leak of freon gas from the train’s air-conditioning system.
"The discharge of freon into the tunnel reduced visibility at parts of the station when the platform screen doors were opened for passengers to exit the train.
"SMRT staff switched on the tunnel ventilation system immediately to disperse the odourless gas.
"The train was withdrawn from passenger service to allow the air-conditioning system to be checked.
"The passenger platform at Tanjong Pagar MRT station remained in service during this incident and train services were not affected.
"We apologise to passengers affected and will be investigating the cause of this incident."