By Jonathan Saul LONDON, June 26 (Reuters) - The United Nations is working with countries to resume the evacuation of hundreds of ships and thousands of stranded seafarers from the Strait of Hormuz after the effort was halted earlier this week, a top U.N. agency official said on Friday. The U.N.'s International Maritime Organization said on Thursday it had "temporarily paused" its evacuation initiative after a container ship operated by Taiwan's Evergreen was attacked.