3 people killed and at least 5 injured in Taiwan station attack

An attacker with a knife went on a rampage in Taipei, killing three people and injuring five others. The man subsequently died during a police chase after falling from a building. Tony Loughran, Director and founder of ZeroRisk International, a global risk consultancy, talks about what to do in the case of a lone wolf attack in Singapore. He also discusses what sort of locations can create high casualty risks in a dense city.