Pakistan’s military has struck deeper into Afghanistan as border fighting intensifies and both sides claimed to have inflicted heavy losses.

The airstrikes came hours after Afghan troops had attacked Pakistani border positions and follow months of worsening ...

The renewed violence between the neighboring countries stems from Pakistan’s accusations that Afghanistan’s Taliban government has harbored a militant group.

Pakistan struck several sites in Afghanistan early Friday in what it calls an "open war." We look at what's driving the renewed fighting.