Boko Haram leader Abubakar Shekau appears in YouTube video
Boko Haram leader Abubakar Shekau had not appeared in propaganda videos for months, triggering speculation that he could be dead or replaced as the group's leaderBoko Haram

The leader of Nigeria-based terror group Boko Haram is reported to have appeared in a new propaganda video after months of silence. In the seven-minute-long footage, Abubakar Shekau stated that he was well, contrary to claims that he had been killed and replaced as head of the terrorist group.

"I have done my part. This message is just to reassure you that I'm alive and actually the one speaking to you," he said in both Hausa and Arabic, according to the BBC. Some Nigerian reports have suggested the leader urged Boko Haram members to "surrender to save themselves". However, IBTimes UK has not been able to verify the claim.

Who are Nigeria's Boko Haram terrorists?

Boko Haram, which has renamed itself Iswap, fights against Western influence in Nigeria and aims to impose its version of Sharia law throughout occupied territories.

The group carries out attacks in Nigeria and neighbouring countries in a bid to take control of more territory. Three Nigerian states − Adamawa,Borno and Yobe − have been under a state of emergency since May 2013.

Boko Haram has killed 20,000 people since 2009 and was deemed the world's deadliest terror group, surpassing its ally, Islamic State (Isis), in November 2015.

Nigeria has become the third most terrorised country as a result of the group's violent insurgency.

Read more about Boko Haram

The video emerged months after Chad's President Idriss Deby alleged Mahamat Daoud had replaced Shekau as the leader of Boko Haram. Shortly after, Shekau released an audio message denying the claim. The leader, however, had not appeared in a video in the past seven months.

Nigeria is leading a regional offensive with 8,700 troops from Nigeria, Niger, Chad, Cameroon and Benin lined up against the terrorists. Although the Nigerian government has claimed several times the fight against the terrorists has been "technically" won, some analysts warned the group is still deadly and able to inflict major casualties on civilians and the military.

The last attack blamed on Boko Haram claimed 22 lives when female suicide bombers detonated explosives inside and outside a mosque in northern Nigeria. Brigadier General Rabe Abubakar, Nigeria's director of defence information, told IBTimes UK the "remnants of Boko Haram" could be behind the blasts, but added the fight against the terrorists was due to end soon.

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Nigeria: Governments must tackle root causes of terrorism or Boko Haram 'will simply regroup in another place'IBTimes UK