Nouakchott, 1 June (AKI) - Police in Mauritania arrested four militants suspected of being members of the al-Qaeda linked Algerian Salafite Group for Preaching and Combat, Radio Sawa reported on Thursday. The militants, all citizens of Mauritania, were allegedly among the organisers of terrorist attacks against Mauritanian military bases in the southern part of the country and of the 1998 attack on the US embassy in Nairobi.Mauritanian authorities have reportedly arrested 21 alleged members of the Algerian terrorist group since the beginning of April this year.