At least twenty people have been killed following a head-on crash at 8.30 AM local time between two commuter trains to the south of the Belgian capital Brussels.
Mayor of Buizingen, Dirk Pieters, said: “The most recent information we have is that 20 people died.”
Rail traffic in the area - including Eurostar services - have been cancelled while the debris is cleared.
Conditions in Belgium have been extremely cold in the past weeks, but no cause has yet been established.
A Belgian railways spokeswoman, said: “There was considerable damage and several people were injured.”