Something wrong? Or someone has escaped?

When I came back from Orchard this evening, I was greeted by two policemen who were holding those army combat guns at Admiralty MRT station. One each at the escalator.

I was wondering, hum? What has happened? I am aware that from time to time, policemen will be onboard the MRT train and patrol around the MRT stations, but usually they come in group of 4, and only armed with handguns. However, today, the two guys were wearing red beret, and holding those combat guns, the long ones.

Someone else has escaped? I hope not! Otherwise we will have a hard time again at all the land checkpoints.