(KUNA) -- At least four Turks were injured Thursday when explosives placed in a trash bin near a bus stop blew up in Eminonu district in the landmark tourist city of Istanbul. Anatolia news agency quoted a security source as saying "a real disaster could have occurred because the area is usually one of Turkey's most crowded places but fortunately it was not so crowded today." Security forces rushed to the area, surrounded it, started investigations and searched for other possible explosives.