Kabul has been hit by a suicide attack, an interior ministry official said, with casualties feared in the first major attack in the Afghan capital in months."The explosion was a suicide attack with civilian casualties," the ministry of interior's deputy spokeswoman Marwa Amini told AFP news agency.The blast took place at the entrance gate of a government-run defence university, the Marshal Fahim Military Academy, Reuters reported quoting security sources.A witness near the scene in western Kabul confirmed the explosion.