New satellite images show vehicles, a fresh access road and excavation at an Iranian nuclear site that was covered up in March. This raised alarms as the International Atomic Energy Agency (IAEA) met in Vienna. The IAEA seeks to promote the safe, secure and peaceful use of nuclear technologies. During a crucial board meeting, the US accused Iran of violating the very nuclear deal that US negotiators are trying to reinstate. ‘Since this board last met, Iran has also exceeded constraints by enriching uranium to 60% U-235,’ the delegation said. The head of the UN nuclear watchdog issued a similar warning. ‘My expectations about this process, of course, were not met,’ the IAEA director said. ‘We have a country that has a very developed and ambitious nuclear programme, which is enriching uranium at very high levels, very close to weapons-grade.’