investigation is partisan. niels, we'll talk to you a bit. >> the turkish military will cross the syrian border shortly. that is according to turkey's communications director who in a tweet last night said kurdish militants in the region can either defect or will be stopped by turkish forces from stopping their push by isis militants. and it struck the syrian/iraqi border from using the route to syria. david ignatius reports the sources have moved by air and by ground. meanwhile, ignatius reports that isis is mobilizing sleeper cells in the see of raqqah.