Algerian authorities believe the Islamist terrorists attacked the In Amenas complex after crossing over from the Libyan side of the border, which is about 20 miles from the site, a senior Algerian security official said.
But "due to the concerns locally in relation to the speed of vehicles passing the site, the applicant is willing to introduce additional measures in the form of a mound crossing and road markings in order to highlight the 30mph speed limit".