Iran's two largest steel plants have been shut down due to multiple rounds of US-Israeli air strikes, the companies operating them say. "Our initial estimate is that restarting these units will take at least six months and up to one year," Mehran Pakbin, deputy head of operations at the Khuzestan Steel Company in south-western Iran, was quoted as saying by Iranian media. Mobarakeh Steel Company said its production lines in the centre of the country had "completely shut down following the high