The commander of the Arab fighters in the Russian republic of Chechnya has been killed. The family of Saudi rebel leader Abdul Aziz al-Ghamdi, better known as Abu Walid, has confirmed his death. There has been no official confirmation, and the circumstances are also unclear. Russian authorities held Mr al-Ghamdi responsible for the Moscow metro attack in February in which forty people were killed. In the 1980s, he fought the Russians in Afghanistan and he has been in Chechnya for the last six years.