President Asif Ali Zardari has called Federal Interior Minister Rehman A Malik and Sindh Home Minister Zulfiqar Mirza at the Presidency to mull over the exacerbating situation in Karachi, report said Wednesday. According to the sources privy to the President House, President Zardari took notice of the law and order situation in the provincial capital and ordered an inquiry into the violent incidents occurring as frequently as ever.