The Afghan Border Police (ABP) secure Afghanistan's 5,529 kilometres (3,436 mi) border with neighboring countries and all its international airports. It also administers immigration services such as checking documents of foreigners entering the country or deporting them. The ABP's anti-narcotic efforts are a prominent concern to the international community at present. The ABP and the regular Afghan National Police jointly patrol a 55 km-wide corridor along the entirety of Afghanistan's border, particularly the longest and porous Durand Line border in the southeast with neighboring Pakistan.