New Delhi, Oct. 12 -- Pakistan and Afghanistan forces clashed along the border on Saturday night. Both sides claimed casualties. While Afghanistan said 58 Pakistan soldiers died in the heavy border clashes, Islamabad shared a far lesser figure, saying 23 of their soldiers were killed in the clashes.

What's happening between Pakistan and Afghanistan? What led to the border clashes? How many soldiers and civilians have been killed? Here's what we know so far:

Pakistan reportedly carried out airstrikes in Afghanistan's capital, Kabul, and on a marketplace in eastern Afghanistan, according to Pakistani security officials and the Taliban. It targeted what it alleged were militant hideouts.

Pakistan has not officially acknowledged the airstr...