ISTANBUL - Turkish tanks crossed into northern Syria from Kilis province on Saturday, while howitzers pounded Islamic State positions in the area, Dogan news agency said.The tanks crossed the border near the Turkish village of Cobanbey, which lies across from the Syrian village of al Rai, Dogan said.A Reuters cameraman in the area earlier heard a repeated booming sound and saw plumes of smoke rising from the Syrian side of the border.
