A sever heatwave continued to batter Pakistan’s largest city of Karachi for a third week, filling hospitals with patients and morgues with boides, officials and rescuers said on Thursday. More than 50 people have died so far due to heatstroke since the start of the latest wave last month, police spokeswoman Summiya Syed said. Dozens of new victims were brought to the city’s largest Jinnah Postgraduate Medical Centre on Wednesday, the hospital’s spokesman Hassan Ali told dpa. The heat index – a combination of the temperature and humidity – rose to 55 degrees Celsius on Wednesday, the highest le…