Pakistani and Afghan forces exchanged fire at dozens of points along their border on Friday, forcing more than 100,000 people to flee their homes, according to the United Nations High Commissioner for Refugees.
The escalation marks the worst violence between Pakistan and Afghanistan in years. Fighting has included Pakistani air strikes on Taliban government sites, including the Bagram Air Base north of Kabul.
Afghan officials said Taliban forces targeted Pakistani military positions along the 2,600 km border and shot down a drone. Pakistani security sources said their forces struck Afghan targets including in Kandahar and destroyed several border posts.