Sources say Pakistani security forces arrested man they believe to be commander of IS branch in the country
Recent attack on Peshawar school reflects brutality of militants under his leadership
Farzana Iqbal slain for marrying man against family's wishes; hundreds of such killings go unpunished yearly, activists say
New estimates say Islamabad has doubled its nuclear stockpile, prompting new worries of an accelerated arms race
Media reports say a top Taliban commander engaged in peace talks with the Afghan government appears to be a shopkeeper from Pakistan