The U.S. Navy says the risk of attacks is too high for now, according to sources familiar with the matter. LONDON, March 10 (Reuters) - The U.S. Navy has refused near-daily requests from the shipping industry for military escorts through the Strait of Hormuz since the start of the war on Iran, saying the risk of attacks is too high for now, according to sources familiar with the matter. The Navy’s assessments spell continued disruption to Middle East oil exports and reflect a divergence from