Ghormach district of Faryab province fallen to the Taliban on Sunday, a source told TOLOnews.
Faryab's police chief Dilwar Shah Dilawar denied the development but said security forces had made a tactical retreat from the district.
Dilawar said that clashes between security forces and the Taliban started in the district on Saturday night and are ongoing.
He also said so far there have been no reports of casualties.
Meanwhile reports indicate that Aqcha district of Jowzjan province is under siege.