Mosul bomber wore Iraqi uniform23.12.2004 - 20:30WASHINGTON (Reuters) - A suspected suicide bomber who killed 22 people in a mess hall at a U.S. base near Mosul, Iraq,probably wore an Iraqi military uniform, the U.S. commander in the area says."What we think is likely, but certainly not certain, is that an individual in an Iraqi military uniform, possibly with a vest-worn explosivedevice, was inside the facility and detonated the (device) causing this tragedy," Brig. Gen. Carter Ham said in an interview with CNNtelevision on Thursday."That's preliminary. We will find out what the truth is and then take necessary actions as we gain more information," Ham said.The explosion on Tuesday was the deadliest attack against Americans since the beginning of the war in Iraq to overthrow SaddamHussein. Of the 22 killed, 18 were Americans.Investigators were seeking to learn how base security was breached, Ham said, and he acknowledged a failure in the Mosul attack."Clearly in this instance I failed to identify some shortcoming that allowed this to occur. That's why we're doing this investigation, tofind out where was that seam that these murderers were able to exploit," he said.It was unlikely the bomber was acting alone and the attack was probably "some time in the planning, days perhaps," Ham said."I think it is probably a well-coordinated action, rather than the actions of one particular individual," he said.Ham said there was no reason to doubt a claim of responsibility made by Iraq's militant Army of Ansar al-Sunna group, which hassworn to attack Iraqi officials and foreign forces until "God's law" prevails.