United States and Saudi Arabia have shared intelligence with each other that indicates that Iran may be planning an imminent attack on energy infrastructure in the Middle East, particularly in Saudi Arabia, a US official tells CNN.A Saudi official told CNN that that Saudi Arabia shared intelligence of a possible attack with the US, but the source did not give any specifics.State Department spokesperson Ned Price said Tuesday that the US is “concerned about the threat picture” and “in constant contact through military, diplomatic, intelligence channels with the Saudis.”“We won’t hesitate to act in defense of our interests and our partners in the region,” Price said at a department briefing.He said that he was not aware of any public warnings issued through the embassy about a threat and confirmed that the State Department is required to inform citizens “if we do have information that is precise, that is credible, that could potentially pose a threat to the American citizen community.”The US believes Iran may be trying to focus attention on Saudi Arabia which Iran accuses of helping fuel protests, sources said.Gen. Pat Ryder would not confirm whether there’s currently a specific threat, but said that the Pentagon remains “concerned about the threat situation in the region,” and is “in regular contact with our Saudi partners.”Iran is Saudi Arabia’s chief regional rival, and Riyadh severed official diplomatic relations with Tehran in 2016 after Iranian protesters stormed the Saudi embassy in Tehran in response to Saudi Arabia’s execution of a Shiite cleric."