LONDON _ The 15 Royal marines and sailors held captive by Iran for 13 days said Friday that they spent much of that time blindfolded and in isolation. At one point they endured what one described as a mock execution.

British sailors and marines held for nearly two weeks in Iran were blindfolded, bound and threatened with prison if they did not say they had strayed into Iranian waters, a Royal Navy lieutenant who was among the capitives said Friday. Lt.

Two additional British personnel among a group 15 detained sailors and marines have admitted trespassing into Iranian territorial waters.