(AP) – The head of a breakaway Taliban faction behind this week’s attack at a northwestern Pakistani university that killed 21 people, most of them students, threatened on Friday to carry out more attacks on schools and universities across the country. On Wednesday, Islamic militants stormed the campus of the Bacha Khan university in the town of Charsadda, gunning down students and teachers, and triggering a gunbattle that lasted for hours before the four gunmen were slain and the military declared an end to the siege.