(AGI) Baghdad, July 18 - Islamic State militants are fightingtroops for control of a key military base in Tikrit, north ofBaghdad. The militants occupied part of the Camp Speichermilitary air base north of Tikrit a few days ago, afterfighting off advancing army troops. They then attacked an armyheadquarters in the Salahuddin province. The Sunni insurgentsdestroyed several military vehicles and killed a number ofIraqi soldiers. (AGI) . .