A suicide bombing targeted a unit of Afghan forces on the outskirts of Kunduz city near the main highway which connects Kunduz with other provinces, including Kabul.
The Ministry of Interior in a statement confirmed the attack but did not give further details.
Sources said the explosion left six members of Afghan security forces dead.
This comes days after the Taliban attacked the city of Kunduz but were pushed back by Afghan forces after almost 12 hours.
The clashes left 56 Taliban fighters dead, according to Ministry of Interior.
Moreover, at least 20 security force members and five civilians lost their lives in the clashes.