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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All 40 people who died in the New Year's Eve bar fire in Switzerland have been identified, police said on Sunday, with teenagers making up more than half of the death toll.
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Numerous teenagers among the dead identified in Swiss bar blaze, police say
Teenagers as young as 14 and 15 were among those who died in the New Year's Eve bar fire that killed 40 people in Switzerland, police said on Sunday, as the Pope offered his sympathies to the victims and their families.
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