The incident took place in Qaisar district late Thursday night after a group of Taliban militants attacked the check post.
Qaisar district chief, Abdul Jamil Sediqi confirming the report said at least six police officers were killed and four others were injured following the attack.
In the meantime, provincial secuity chief Gen. Mohammad Naeem said Afghan police forces have launched an operation to retake the control of the check post which was taken by the Taliban militants on Thursday night.
He did not disclose furhter information regarding the casualties of the Afghan police forces following the incident, but he said that Afghan army in Faryab province was requested to assist the Afghan police forces in retaking the check post from the Taliban militants.
The Taliban militants group has not commented regarding the incident so far.
Faryab is among the relatively peaceful provinces in northern Afghanistan, however militants from the Taliban group and other insurgents groups have recently increased their insurgency activities in a number of its districts.