"The force tweeted a warning telling people in the area to run to safety, hide and then call police if it is safe to do so."

Still wonder why your country is a favorite target?  Generations before us would fight a bully, this generation tells us to hide and hope for the best.  Run, hide, tell is about as pathetic as it gets.  We no longer have to worry about the terrorists winning, they've already won when the best advice is hiding.