WASHINGTON, April 14 -- US President Donald Trump warned Monday that any Iranian attack boats that approach the American naval blockade around Iran's ports would be destroyed, despite international calls for a ceasefire to be respected and negotiations to resume.

The US military said the blockade, which took effect at 1400 GMT, applied to all ships leaving or seeking to dock at Iranian harbors.

In a social media post, Trump said the bulk of Iran's navy had already been destroyed during the war, but that if any of what he said were Tehran's few remaining "fast attack ships" approach the blockade "they will be immediately ELIMINATED."

He also said 34 ships had passed through the strait on Sunday, adding it was the most since the war bega...