Pakistan says starts fencing Afghanistan border in "high-threat zones"

ISLAMABAD (Reuters) - Pakistan has begun building a fence on its disputed 2,500 km (1,500 mile) border with Afghanistan to prevent incursions by militants, Pakistan's army chief said, in a move likely to further strain relations between the two countries.

Pakistan has blamed Pakistani Taliban militants it says are based on Afghan soil for a spate of attacks at home in recent months, urging Kabul to eradicate "sanctuaries" for militants.