Not sure why the incident was but I came home via MH and the police were removing police tape from the southbound platform and cleaning up blood from the ticket hall.
At 5.50 there were plenty of coppers, none armed with guns, including 2 at the bottom of the escalators and many more at ticket hall level. Plus a lot of police vehicles above ground. No idea what it was about though.
A man who works at the station told me there had been a stabbing, but it hasn't been on the news, so I'm not sure it's true.