US intelligence officials on Tuesday told skeptical lawmakers that North Korea appeared to be taking the first steps to implement a recent nuclear disarmament agreement, but they said they would keep close tabs on the North's actions. Lt. Gen. Michael Maples, head of the Defense Intelligence Agency, said officials had seen North Korea begin inspections of its main nuclear reactor, which the North pledged to shut down and seal in return for an initial load of fuel oil. More aid would follow if the North disabled its nuclear programs. "There are parts of this nuclear program that we have to pay a lot of attention to, to see if we have the kind of disclosure and the inspection capabilities that we're looking for," Maples said at a Senate Armed Services Committee hearing. He did not provide specific details on the intelligence.