john. >> reporter: yeah, you're right, dee land in terms of those reinforcements, once they arrive they will basically start gearing up for street to street combat. at this point iraqi forces and those shooe a fighters have essentially surrounded tikrit's city center. iraqi commanders say that at this point they're preparing the next plan of attack to head in to the city center. as mentioned, those kraek forces are getting help from iranian backed shia fighters. okay. though, iran has been involved in the assisting the training and also the arming of those shia fighters and there is also reports that one of iran's top commanders, has been involved with the operational planning. there are some reports that he is actually been leading the overall operation. now, we haven't been able to actually confirm that.