A bomb blast hit a passenger van on the premises of a university in Pakistan's Karachi city on Tuesday, killing four people including three Chinese nationals, local media reported.The explosion happened near the Confucius Institute — a Chinese language teaching center at the University of Karachi, Geo News reported, adding one of those killed was the director of the institute.Four others were injured in the blast, including a Chinese national.Karachi police chief Ghulam Nabi Memon said that according to the initial investigation, a burqa-clad woman may be involved in the suicide attack.He said that those who were killed in the blast were teachers.There was no immediate claim of responsibility for the attack.The post Three Chinese nationals among four killed in Pakistan blast first appeared on Ariana News.