Iran accused Israel and the United States on Monday of having attacked its nuclear facility at Natanz, one of the main targets of the previous conflict between the three countries last June.“The criminal regimes of the United States and Israel, pursuing their aggression, again targeted the Natanz nuclear site on Sunday afternoon in two brutal attacks,” Iran’s atomic energy chief Mohammad Eslami said in a letter to the UN’s nuclear watchdog quoted by state news agency IRNA.The UN agency’s head had said on Monday that there was “no indication” any nuclear installations had been hit.