- Mohamed Abdallahi Ould Ahmednah,
- Sidi Mohamed Ould Bezeid and
- Mohamed Mahmoud Ould Khouna,
have all denied the charges.
Al Qaeda's branch in North Africa (AQIM) had claimed responsibilty for the killing, saying they shot Leggett because he was trying to convert Muslims to Christianity.
Mauritania is among several countries in the Sahara region where al Qaeda-linked fighters have raised their profiles with a series of attacks and kidnappings.
AQIM grew out of the militant Salafist movement in Algeria and has moved south where it is taking advantage of the vast and lawless desert sahel regions of Mauritania, Mali and Niger.
The Rest @ Reuters, Africa