What can be done to prevent Berlin-style attacks in modern cities?

By Josh Halliday and Frances Perraudin

Terrorist attacks using vehicles are very hard to prevent – but there are safety measures cities can use, experts say

The Berlin lorry attack on Monday that killed 12 people and injured 48 others raises a pressing question for security services across the world: what can be done to stop such attacks?

The attack on Berlin's Christmas market came six months after a 19-tonne cargo truck was deliberately driven into crowds celebrating Bastille Day in Nice, killing 86 people and injuring 484.

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Source: What can be done to prevent Berlin-style attacks in modern cities?