Something is happening here, but no one knows what it is. From AP, with thanks to EPG:
TEHRAN, Iran – Iran confiscated three British military vessels Monday and arrested eight armed crew members, state-run television reported.
The three British ships entered Iranian territorial waters not far from the Iran-Iraq border, the Arabic language Al-Alam television reported. The station is part of the state-run Iranian radio and television network. …
In London, the Ministry of Defense said it was investigating the report but did not know if it was true. There were no British warships operating in the Shatt al-Arab waterway, but some smaller vessels were there, the ministry said. …
The Foreign Office said British diplomats in Tehran had been in contact with the Iranian government but it was still unclear what had happened.