Security officials have been closely monitoring a university in east Pakistan attended by Tashfeen Malik, the woman involved in last's week's mass shooting in California, because of concerns that Islamist militancy was taking hold there.
Malik, a Pakistani, attended the sprawling Bahauddin Zakariya University to study pharmacy between 2007 and 2012, after she had lived most of her life in Saudi Arabia.
Police and security officials on campus in the Punjabi city of Multan said intelligence officers had been stationed there to monitor militancy among 35,000 students studying in red-brick buildings set amid neatly kept grounds.
The enhanced security and monitoring was in response to the massacre of 134 pupils at an army-run school in the northwestern city of Peshawar a year ago that was blamed on the militant Pakistani Taliban movement.
Malik had finished her studies by then, and officials said there was no evidence so far that she was radicalized at the university or had links to any particular militant group.
But the tight security raises questions about Bahauddin Zakariya University itself and the potential for extremism being promoted in higher education in Pakistan more broadly.