"A clash between a border patrol and a nine-strong group, which was armed to their teeth and had crossed over from Afghanistan, took place near the Panj border post," the border guards said, calling the fighters a "terrorist group" and "smugglers."
The Panj border post is 190 kilometres south of the Tajikistan capital Dushanbe.
The clash took place early yesterday.
The fighters had crossed over from Afghanistan's northern Kunduz province, the Tajik border guards said, adding that they killed one fighter and wounded another one.
Last year Tajik border guards took part in 30 armed skirmishes with drug smugglers from Afghanistan, killing 16 armed fighters.