Campsite UK police raid the Greenacre caravan site in Leighton Buzzard, rescuing 24 men who had been held there as slaves in squalid conditions .
Gothenburg Police in Gothenburg, Sweden, arrest four people after a suspected failed terrorist attack.
Car bomb A truck bomb at a military outpost in Wardak Province, Afghanistan, kills several civilians.
Ground Zero Memorial ceremonies are held at New York's Ground Zero and elsewhere in the United States, to commemorate the tenth anniversary of the September 11 attacks. Ceremonies are also held worldwide to mark the anniversary of the attacks.