News reports have emerged that Raffles Place MRT station was hit by a freon gas leak on Monday night, and this leak caused a train to be filled with "smoke". This happened at about 8:45pm on Monday.
Luckily the gas was non-toxic and non-flammable, but witnesses said the train was very hot when the leak occurred, and naturally, passengers started to panic. Imagine being in a train, when it suddenly filled up with smoke and you started to feel hot. And being on a train, you had nowhere to run.