At least three people have been injured after a bomb exploded in a suspected terror attack on the Turkish city Istanbul. The device was detonated near a bus station in the Mecidiyekoy district of central Istanbul, Saturday The area was sealed off by cops as emergency services arrived at the scene. The injured civilians were taken to a nearby hospital. The explosion followed a warning from the US Embassy earlier Saturday of "credible threats" of attacks in tourist areas of Istanbul and Antalya.