The U.S. military opened a probe Friday into a deadly blast at an army base in northern Iraq that killed 22 people, trying to determine how a suicide bomber managed to enter the heavily fortified facility. An investigation team, led by Brig. Gen. Richard P. Formica, started its work in Mosul as U.S. Defense Secretary Donald H. Rumsfeld paid a surprise visit to the wounded soldiers at the base. "The main person in charge of the investigation arrived last night and he's starting his investigation today," Lt. Col. Paul Hastings said, a U.S. spokesman in the Mosul base said. "Now we have a pretty good idea that it was a suicide bomber," Hastings said. "He (Formica) is going to investigate into the how's _ how did that happen?" "The investigation will be conducted quickly and thoroughly," Hastings added, however, there is no deadline set for the conclusions to come out.
