The statement did not explicitly say whether the Nigerian army considered the man in the video to be Shekau.
Dozens of Boko Haram members were killed and wounded while 30 Nigerien and two Nigerian soldiers died and another 67 got injured during the attack
He declared in the Hausa language: "For me the end has come"
Little to show since Boko Haram took on the Islamic State's brand—militants in disarray as Buhari closes in
The world's deadliest designated terrorist organisations were supposed to be formidable once they united. Instead the Africans appear even weaker.
Buhari orders high profile arrests after report shows billions wired to ghost firms aided Boko Haram rampage
Former powerful national security advisor Sambo Dasuki among those fighting to save themselves following presidential probe's interim findings.
UPDATE: Death toll in Lake Chad area rises to 50; militants blew themselves up in the middle of crowds
Northern Cameroon killings join attack on Chad's Baga Sola, which, believed to be relatively safe, has attracted thousands of refugees.
14-year boy linked to radical Islamist group Boko Haram arrested spying.
What clean, no-nonsense, anti-corruption Buhari could learn from the sneaky, murderous and shadowy Shekau.
In an eight-minute Hausa-language message, elusive Nigerian militant rebuffs claims by Chadian leader Idriss Deby that he had been replaced.
Deby says Nigerian jihadists can be defeated by end of the year, and have new leader called Mahamat Daoud. Deadly Abubakar Shekau is presumably dead.
More than 650 people have lost their lives since new president came to power on May 29.
The attacks came on the day Nigerian president pledged $100 million to a regional force at a meeting with the presidents of Chad, Niger and Benin.
At least 55 people were killed last week in two raids on villages near the Borno state capital, Maiduguri -- the first attacks there in three months.
Drop the slogan “Bring Back Our Girls” for “Find the Girls” and raise the bounty on terror leader Shekau's head - $7m is not big enough.
Squeezed out of captured territory, security analysts predict a rise in bomb attacks in towns and cities.
I got Boko Haram wrong, Nigerian president Jonathan admits, hopes to catch militants' leader before election
Goodluck Jonathan admits he underestimated threat posed by the militants, hopes to catch their leader before the March 28 poll.
Boko Haram solution not just on the battlefield, UN chief warns as Central Africa presidents meet over strategy
Social and economic challenges must also be taken into consideration, Ban Ki-moon says in message to regional leaders
Six Africa Updates: Finally Nigeria says Boko Haram chief killed and Ebola over, Russia holds 355 African students, and more
Russia placed about 1,000 residents from African countries in quarantine.
Sections of the Nigerian military believe the original Boko Haram died years ago, and those claiming to be him are just "copies".