The embattled leader of jihadist group Boko Haram, Abubakar Shekau, resurfaced in a video posted online Sunday, rejecting assertions by the Nigerian army that he had been seriously wounded.
"You have been spreading in the social media that you injured or killed me," Shekau said in the 40-minute video released on YouTube and dated September 25.
"Oh tyrants, I'm in a happy state, in good health and in safety."
The Nigerian army said on August 23 that the longtime militant chief had been seriously wounded in the shoulder in an air raid in which several commanders were killed.
Nigerian authorities have reported him dead several times before, but the army's latest claim was bolstered when Boko Haram - which pledged allegiance last year to the Islamic State (IS) group - released a video on September 13 without Shekau in it.
However, in the video released Sunday, Shekau points to a date on an Islamic calendar corresponding to September 25, 2016.
Speaking in Hausa, Arabic and English and in dialects spoken in north-east Nigeria he appeared to be in good physical health.
He used the video to issue threats against President Muhammadu Buhari, who appealed to the United Nations this week for help in negotiating the release of the Chibok schoolgirls kidnapped by the militants more than two years ago. "If you want your girls, bring back our brethren," Shekau says.
Boko Haram, which has killed at least 20,000 people since 2009 in its quest for a hard-line Islamist state in north-east Nigeria, has been in the grip of a power struggle since late last year.
Last month, IS high command said Shekau had been replaced as leader by Abu Musab al-Barnawi, the 22-year-old son of Boko Haram's founder Mohammed Yusuf.
But Shekau has maintained he is still in charge. The first signs of a rift appeared after Shekau pledged allegiance to IS in March 2015 and changed Boko Haram's name to Islamic State West Africa Province (ISWAP).