KARACHI - A low-intensity blast at cafeteria of Karachi University (KU) on Tuesday left two students, affiliated with Imamia Student Organisation (ISO), wounded. The varsity was closed for three days after the explosion. The blast occurred at a time when the activists of ISO were about to offer Zuhar prayer in the lawn of main cafeteria of the university. Following the blast law enforcement agencies, Bomb Disposal Squad (DSP) and ambulances of various welfare organisations rushed to the spot for shifting the wounded persons to the hospital. BDS officials, investigators of Special Investigation Group of FIA and various other agencies reached the spot to evaluate the nature of the blast. Experts after the preliminary investigation disclosed that the bomb was planted at the stall of ISO where workers of ISO used to offer the noon prayers daily. Vice Chancellor KU Dr Pirzada Qasim, Commandant Shokat DIG East, SSP Naeem Shaikh, TPO Gulshan-e-Iqbal, SP Mazhar Mashwani of Crime Investigation Department (CID) and SP Raja Umar Khattab of Special Investigation Unit (SIU) also rushed to the site of blast. Investigators of SIG and BDS, while talking to The Nation, said that it was a low intensity blast in which terrorists used explosives weighing around 150 to 200 grams. They also added that the blast could be more harmful or fatal if the terrorists had used pellets in the device exploded. Bomb affected the cafeterias wall, window and destroyed a tree which further reduce intensity of the bomb and saved the lives of the students offering prayer. BDS and SIG investigators preserved the crime scene evidences and samples from the clay and took away for the laboratory inspection. DIG Commandant Shokat, while talking to media, told that the actual nature of the blast and explosive would be determined after the laboratory examination. In the aftermath of blast, scores of the students of ISO chanted slogans against the KU administration and Rangers deployed in the university. Qasim Karbalie, senior leader of ISO when contacted, said that two out of four students were wounded critically including Wajid Ali and Irfan Hayder while two others got slightly injured were discharged after they received the first aid. He said that they had informed the administration of the KU about the extremist elements present in the various student organisations but administration did not take any action. He pointed out that a complete wing of rangers was deployed in the campus but they were reluctant to provide security to students. On the other side, enraged ISO workers staged a protest and took out a rally from the campus to University Road and chanted slogans against Rangers and the administration. It is pertinent to mention here that investigators are looking into different aspects that could possibly have led to the blast including disputes of ISO with rival student organisations. Sources informed that the details of recent clash between ISO and PSF, which took place a couple of weeks ago, might assist the investigators in establishing a conclusion.