Iran would be wrong to believe it will be "off the hook" over its disputed nuclear programme during the transition to a new US administration, a US official said on Thursday. "One thing we all have to worry about is ... that somehow the Iranian leadership may think they are off the hook for a period of time," said Gregory Schulte, US ambassador to the International Atomic Energy Agency. "What they need to understand through our considered diplomacy is that they are not off the hook," he told reporters.