Libya's southwestern tip in the Sahara bordering Algeria and Niger has turned into an open door for illegal migrants from sub-Saharan countries heading for Europe, with the chaotic government in Tripoli appearing to have abandoned all control. The revolt that overthrew Libyan leader Muammar Gaddafi three years ago emptied Libya's arsenals, flooded the region with guns and dismantled much of the state apparatus, giving well-organised smuggler networks the run of the border. Border officials say up to 200 Africans cross the Ghat border strip every day, most headed north to the Mediterranean coast for the onward trip to Europe by boat.