By Mehreen Zahra-Malik and Jibran Ahmad PESHAWAR, Pakistan (Reuters) - A group of militants stormed a university in volatile northwestern Pakistan on Wednesday, killing at least 19 people and wounding dozens as the army hunted for any gunmen still holed up on the campus, officials said. A security official said the death toll could rise to as high as 40 as the army cleared out student hostels and classrooms. A spokesman for the rescue workers, Bilal Ahmad Faizi, said 19 bodies had been recovered including students, guards, policemen and at least one professor.