A powerful blast ripped through a military hospital in Kabul Saturday, killing at least six medical students and wounding many others, the Afghan Defence Ministry said. The blast took place in a tent used as a dining room by students at the city centre hospital, one of the biggest and best-equipped in Afghanistan. The hospital is not used by NATO forces, though it is thought that foreign medics are frequently stationed there to train their Afghan counterparts. "There was a suicide attack at a tent used as a dining facility by medical students inside the hospital," said defence ministry spokesman General Mohammad Zahir Azimi. "The blast killed six people and wounded 23 others and all of them are medical students."