Pakistan police to-day [December 13] opened fire at two places in Chittagong in East Pakistan, injuring 12 persons, according to a Radio Pakistan broadcast monitored here [New Delhi] to-night. A violent crowd attacked a food train during the Opposition-sponsored province-wide hartal to-day. When the police interfered, the crowd attacked them. The police then opened fire, injuring three persons. Police also opened fire on a crowd which indulged in setting fire to transport buses and public vehicles. Six persons were injured in this firing. Police were reported to have rounded up a large number of “suspects” in major cities throughout East Pakistan where the strike call appeared to have been obeyed by the majority of workers. One of the men arrested in Dacca was Colonel Mukhtar Husain, Private Secretary to Independent Opposition leader Air Marshal Asghar Khan. The Colonel was arrested outside a mosque as he and Air Marshal were talking to newsmen. Air Marshal Asghar Khan protested against the arrest and asked to be detained himself, but the police refused.