Could Derna's disaster have been avoidable?

As a wall of water washed through the Libyan city of Derna, it took everything in its path. <br /><br />What’s left, is a ghost town, where the number of missing exceeds the dead and overwhelms the living.<br /><br />Now, feelings of shock and grief give way to anger, as those who are left, demand answers. <br /><br />So, why did Derna’s dam fail to protect its residents? And who’s going to take responsibility? <br /><br />From Libya, ITV News Correspondent Emma Murphy tells Lucrezia Millarini What You Ned to Know...