OKARA: Professors of the Government Postgraduate College Okara Friday protested the killing of Prof Khalid Waheed of Bahawalpur. Professors Rao Ijaz, Muhammad Asghar, Shahid Salimi, Rao Afzal, Naveed Asim, Shahid Ali and others raised slogans against the killing of Prof Khalid. They said teachers were a respectable community in society and they must be accorded regard.