You have to wonder, are we watching a militant group, or a criminal business. Whatever might be happening it is apparent that ISIS fighters have an ability to move freely from country to country. Libya is now under threat from ISIS in a well organised move as fighters return from Syria. This is the west's worst nightmare, that the fighting is not contained to Syria and Iraq
ISIS comes to Libya - CNN.com
There is, perhaps, one advantage the west can exploit the fighters in Libya are much more accessible than those in Syria