Reports from northwestern Pakistan say Afghan and Pakistani security forces along the border exchanged gunfire late Wednesday.
Pakistani authorities say Afghan troops began firing at a checkpoint across the border, and the Pakistani side was forced to respond. The Pakistanis say at least two of their security personnel were wounded.
Afghan security officials blamed the other side, accusing the Pakistanis of trying to take control of a checkpoint inside Afghan territory.
The exchange of gunfire took place in the Goshta district of eastern Nangarhar province, Afghanistan.
It is the latest incident in a series of cross-border clashes, in which Afghan and Pakistani authorities have traded blame.