Iran's Revolutionary Guard says it fired ballistic missiles at a base in Jordan used by the US military and attacked 10 ships on Wednesday after the US said it had destroyed five Iranian oil tankers.

The latest round of clashes, which began with US raids last week, comes amid a deadlock in the six-month war.

Revolutionary Guards launch retaliatory missile barrage at US base in Jordan, threaten ships in Kuwait and Bahrain; CENTCOM says submarine drone seized by Iran was 'defective'