All border crossings between Pakistan and Afghanistan remain closed as the countries traded fire for the second time in a week.

The closures entered a fourth day on Wednesday after deadly weekend clashes spiked tensions along the 1,622-mile-long (2,611km) border.

It was not clear when the border might reopen, with hundreds of lorries lining the access roads, waiting for bilateral trade to resume.

The fighting started on Saturday night when Afghan forces struck several Pakistani military posts.

Afghan officials claimed to have killed 58 Pakistani soldiers, but Pakistan's military said it lost 23 soldiers and killed more than 200 "Taliban and affiliated terrorists" in retaliatory fire along the border.

Image: Smoke rises from a hillside in Khost province, Afghanistan, on Sunday after

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