Afghan officials have blamed the Taliban for attacking their security checkpoints in northern Sari Pul province, leaving at least seven members of their forces dead.
The insurgents also abducted two members of the force and left five wounded, officials said, adding that four Taliban fighters were killed in the gun battle.
The troops were in charge of providing security for fuel wells in the area.
The Taliban is yet to claim responsibility for Sunday's attacks.
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France's top court blocks social media ban for under-15s
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Japan's record rains strand thousands at Narita airport; kill eight
Record rainfall in Japan stranded thousands of travellers at Tokyo's Narita airport on Friday, bringing floods to the surrounding area that disrupted transport, knocked out power to 20,000 homes and killed eight.
Wildfires in Britain hit record levels after homes burn in intense heat
Wildfires in England and Wales have hit a record level, fire chiefs said on Friday, warning that rescue services were battling to keep up with rising risks a day after fires raced from tinder-dry fields to engulf houses on the hottest day of the year.
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