Terrorism: Afgan refugee plows heavy truck into shoppers killing 12 and leaving 48 injured in Berlin, Germany.

A heavily loaded 25-tonne articulated lorry with its lights off drove to through shoppers at a busy Christmas market at Breitscheidplatz Square, outside the Kaiser Wilhelm Memorial Church, Berlin, Germany killing 12 people and leaving 48 injured.
What should be done to the refugee treaty amongst European countries now that it appears it proves danger to their citizens?
To the victims of this horrible and senseless incident Rest In Peace
The killer driver reportedly an Afghanistan refugee who arrived Germany in February fled the scene but was later captured at a nearby zoo (the animal went back home).
This' just a few hours after Russia Ambassador to Turkey Andrei Karlov was shot and killed by a man identified as 22-year-old Mevlüt Mert Altintaş (read here) at an art gallery in Ankara, Turkey.