Not good:

NPR : Iranian Navy Detains British Sailors in Persian Gulf: “All Things Considered, March 23, 2007 · The Iranian navy detained 15 British sailors and marines today, in disputed waters in the Persian Gulf. The British defense ministry says the troops were seized and held at gunpoint after inspecting a cargo ship.

The British government quickly protested Iran’s action, saying that the Royal Navy was engaged in routine boarding operations while protecting Iraq’s territorial waters.” More…