0539 GMT - The U.S. 30-year Treasury yield hits a 19-year high of 5.237% in Asian trading as yields jump across maturities following fresh strikes by U.S. forces against Iran on Wednesday night. The U.S. military called the strikes a "powerful response" to Iran's missile attacks on U.S. forces in Jordan. Short-end Treasury yields closed lower on Wednesday following the Federal Reserve's "hawkish hold," while long-end yields ended the session higher, featuring a steepening pattern. The steepening continues in Asian hours, with long-end yields rising more than short-end yields, according to Tradeweb data. The two-year Treasury yield is up 4.9 basis points at 4.283%, while the 10-year yield is up 7.8 basis points at 4.699%.