Pakhtunkhwa Milli Awami Party chief Mehmood Khan Achakzai has voiced concerns over Karachi situation, saying that the port city has become bastion of terrorism.Speaking in the National Assembly, Achakzai demanded investigation into May 12 incidents and said that without it Pakistan could not move forward.He said after creation of Pakistan, instead of real politicians, corrupt people tried to run the country. How can such people run the country, he questioned.