The attacks by Houthi rebels on shipping in the Red Sea have highlighted the on-going civil war in Yemen, which began in 2014. A civil war is defined as a war between citizens of the same country. These non-international armed conflicts are often protracted and brutal, with some playing out for decades. And civil war is nothing new. History records this type of military engagement taking place as far back as antiquity. But what are the world's deadliest civil wars?7
Click through and relive some of the worst wars to take place within the same state.