LONDON, June 25 (Reuters) - The United Nations’ shipping agency on Thursday paused an evacuation effort to get hundreds of stranded ships and thousands of seafarers out through the Strait of Hormuz after a vessel was attacked in the Gulf of Oman. "I have been informed of an attack today in the Gulf of Oman on a vessel which passed through the Strait of Hormuz. This vessel did not transit under IMO’s evacuation framework," Arsenio Dominguez, Secretary-General of the U.N.'s International Maritime Organization (IMO), said in a statement.