LAHORE, Pakistan — Pakistani police fired tear gas and charged at student protesters who ransacked a college building Thursday, as anger spread over an alleged on-campus rape. Tensions have been high on college campuses since reports about the alleged rape in the eastern city of Lahore went viral on social media, and protests have broken out in four cities so far. [time-brightcove not-tgx=”true”] The latest violence started when hundreds of students demonstrated outside a campus in the city of Rawalpindi in Punjab province.