Iran's top-diplomat said any decision to target the country's cultural-sites would be a "war crime", hours after US-President Trump threatened such action in a tweet. "Targeting cultural sites is a WAR-CRIME," Mohammad Javad Zarif tweeted in response to a post by Trump warning the US is targeting 52-sites in Iran and will hit them "very-fast and very-hard" if the Islamic-republic-attacks American personnel or assets.