This is the World News coming to you from the BBC in London.

The government of Tanzania's semi-autonomous island of Zanzibar says it'll set up an investigation to establish why a heavily overloaded ferry sank on Friday night with more than 800 people on board. More than 180 people

drown

ed in the accident between the islands of Zanzibar and Pemba, many of them children.

A weekend of ceremonies has begun in the United States to mark the 10th anniversary of the 9/11 attacks. In his weekly address, President Obama said justice had finally been delivered to Osama Bin Laden and al-Qaeda was on the path to defeat. From New York, here's Jonny Dymond.

In the fields of Shanksville in Pennsylvania, Vice President Joe Biden, former presidents Bill Clinton and George W Bush are

dedicat

ing a national memorial for the 40 passengers and crew killed when United Flight 93 was wrested from the hands of hijackers. Earlier today, George Bush was at the Pentagon, where he laid a wreath of white lilies and roses. One hundred and eighty-nine people were killed there when American Airlines Flight 77 slammed into the building. Tomorrow, the focus will be here on New York, where the World Trade Center once stood. The name of every victim will be read out.

The leader of South Africa's ruling party's youth wing, Julius Malema, has given a

defiant

speech the day before he faces a

disciplinary

hearing by the African National Congress. Mr Malema, who's accused of bringing the ANC into