More than 1,000 Afghan soldiers have fled to neighbouring Tajikistan after clashing with Taliban militants, officials have said.
The troops retreated over the border to "save their own lives", according to a statement by Tajikistan’s border guard.
The surge coincides with the end of Nato’s 20-year military mission in the country.
The vast majority of remaining foreign forces in Afghanistan have been withdrawn ahead of a September deadline, and there are concerns that the Afghan military will collapse.
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