Cheikh Ould Saleck, on death row since 2011, was last seen by fellow inmates at Nouakchott central prison at midday Thursday, according to the source.
"His absence from group prayers in the evening alerted his fellow Islamist inmates, who went to get him and found his cell locked," the source told AFP yesterday.
A guard smashed open the door and found a flag of Al-Qaeda in the Islamic Maghreb (AQIM), the group's north African franchise, the source added.
A Mauritanian gendarme was killed and eight wounded in a firefight following the failed attack, while four suspected AQIM members died.
The Nouakchott prison houses more than 30 jihadis, several on death row, although the country's most dangerous inmates are kept in a prison garrison located in the north.
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