Pakistan has begun to fence its over 2,400-kilometre-long, porous border with Afghanistan. <br/><br/>Pak Army on Tuesday said the phased fencing of entire Pakistan-Afghanistan border has commenced. <br/><br/>It said in the first phase high infiltration-prone border areas in Bajaur, Mohmand and Khyber Agencies are being fenced. In the second phase, fencing of remaining border areas including the restive Balochistan province will be executed.<br/><br/>Pakistan shares a long and porous border with Afghanistan, which runs through mountainous terrain and is largely unpatrolled. <br/><br/>The Durand Line was drawn by the British rulers in 1896 and is disputed by Afghanistan, which also resists Pakistani attempts to erect any border fence.