Bomb blast in Istanbul wounds four people: media

ISTANBUL (Reuters) - A bomb blast in the Istanbul district of Maltepe wounded four people overnight, Turkey's state-run Anadolu Agency reported on Monday. It said the wounded were hurt by metal pieces from the device which was planted under an overpass on a highway. It was not clear how badly hurt they were or who planted the explosives. (Reporting by Ceyda Caglayan; Editing by Daren Butler)