Karachi. Police and rescue officials said at least five people were killed and two others injured after a government school wall collapsed in Pakistan's southern port city of Karachi.Seven people were rescued from under the debris in the incident that occurred in the Mominabad area of Orangi town, a spokesperson for the rescue service said.According to him, three people died on the spot while two more died while being taken to a nearby hospital for treatment.Police have speculated in their initial investigation that the incident may have occurred because drug addicts often gathered near the wall and allegedly removed iron...