"Copenhagen is under attack and nobody knows who is responsible" were the chilling words of the Copenhagen Post after a second bomb in four days exploded in Denmark's capital city. It isn't yet known whether the two blasts are connected, or what the motivation is behind them.

A bomb exploded outside Nørrebro Police Station in the early hours of Saturday (August 10) morning. No injuries were reported. This followed Tuesday (August 6)'s attack on the Tax Authority's headquarters on Østbanegade, which saw one person pick up minor injuries.

Read more: Forbes