At least 17 people died after Islamic State (IS) group militants attacked a border post on Tajikistan’s border with Uzbekistan, the BBC reports.
The 20 fighters attacked at 03:00 local time (22:00 GMT), killing a border guard and a police officer but losing 15 men in the ensuing firefight, they said.
IS has not confirmed its involvement.
Police have closed roads in the area, while Uzbek border authorities are reportedly watching the situation.
Five of the militants were captured after the attack, which took place 60km (37 miles) south-west of the Tajik capital Dushanbe.