Abubakar Shekau, the leader of the terror group Boko Haram, is said to be weakened by ill health, prompting questions about his ability to lead the militants.
A report published by an international news agency source said Shekau has a range of conditions that have left him “too weak to be in charge” of the jihadists, whose insurgency has killed at least 20,000 in Nigeria since 2009.
“He has high blood pressure and failing sight from diabetes-related complications,” said one source with close knowledge of the group’s activities.
A senior security source tracking the conflict, who also asked not to be identified because he was not authorised to speak to the media, described Shekau’s diabetes as “debilitating”.
“He suffers from diminished eyesight from cataracts or glaucoma as a result of diabetes,” he added.
The source with knowledge of Boko Haram’s activities said Shekau and his lieutenants have been in talks this week about his “failing health” and whether he was well enough to lead.
Boko Haram split in mid-2016 over ideological differences.
One faction, headed by Abu-Mus’ab Al-Barnawi, whose father Mohammed Yusuf founded Boko Haram, won the support of the Islamic State group.
Some experts suggested that with Shekau off the scene, the different groups could be reconciled.
Shekau used to appear frequently on video messages from the group, particularly at the height of the conflict, when Boko Haram ran riot across northeast Nigeria, seizing territory.
The Nigerian authorities have claimed Shekau has died or been killed on at least three occasions, and that he has been replaced by a series of lookalikes.
Shekau’s last appearance on camera was in a 14-minute video released on February 6 in which he claimed responsibility for attacks in Borno state capital, Maiduguri, and other towns.