The bombers forced their way into the university campus. While one suicide bomber blew himself up near the cafeteria in the girls' section, another blast occurred in the Shariah faculty in the boys' block.

Two female students were killed and about five injured in the girls' section and another four in the boys' block. Officials gave conflicting accounts of the blasts and casualties. But city police chief Tahir Alam said: "Both were suicide blasts."

According to initial information, two girl students have been killed," interior minister Rehman Malik said. Malik was booed and forced to return from the university with students shouting "shame, shame" while some even threw stones on his bulletproof car.

They blamed the minister for failure to ensure full security of the city and demanded his resignation.

"There was a big bang that damaged the building severely," university student Aleemullah said. Thirteen injured, 11 female students and two men, have been shifted to PIMS hospital where four are said to be in critical condition.