Turkish TV Channel 7 reports hundreds of Turkish army tanks and vehicles at the border with northern Iraq, the bit not held by Saddam Hussein's forces.
The report, which is breaking news, seems to be unclear as to whether they have already crossed or are merely about to. The report also says US troops have been sighted at Mardin, which is inside Turkey, close to the border with Syria. Whether they are also en route to northern Iraq is unclear.
A retired Turkish army general said the move to the border was "precautionary".