U.S. manufacturing activity held steady in April, but supplier delivery performance worsened as the war in the Middle East disrupted shipping in the Strait of Hormuz, boosting prices for raw materials and other inputs to a four-year high. Concerns about the U.S.-Israeli war with Iran dominated comments from manufacturers in the Institute for Supply Management survey published on Friday, with some makers of chemical products saying "all products tied to crude, polyethylene resin or energy have seen multiple increase spikes tied to the Iran crisis and market supply inflation."