Boko Haram leader Abubakar Shekau has threatened to attack the Emir of Kano,  Muhummadu Sanusi II, in retaliation for the Emir's call on Kano residents and other Nigerians to defend themselves against the terror organisation.

In a video released last weekend, Shekau said his group does not consider the emir a true Muslim.

The Emir had earlier issued a call to arms after a series of deadly attacks by suspected Boko Haram militants in Kano.

Boko Haram launched a deadly assault on the Kano Mosque near the Emir's palace on November 28, detonating multiple bombs and shooting worshippers.

Over 100 people died in the attack.

The Emir, who was abroad during the attack, returned to lead prayers at the site of the blast, the following day.

In a 19-minute new video first released Saturday, Shekau did not claim responsibility for the mosque attack. But he said his group remains prepared to kill anyone who challenges its ideology, and all non-Muslims and "fake" Muslims.

In a report published by online medium Premium Times, Shakau was quoted to have said: "Before I start talking to my brothers who believed in me and the religion of Allah, not the religion of democracy, not that of western education, those who believed in the religion of the Quran, not that of the constitution and not religion of the Emir of Kano Sanusi Lamido Sanusi, Jonathan, Obasanjo, Atiku, Babangida, Obama, Bush, Clinton, but the religion of Allah," he said.

Mr. Shekau said his group will fight local vigilantes and hunters, who have successfully crushed the advances of its fighters in some parts of the Northeast.

Shekau condemned all other Islamic sects in the country calling them pagans.

He said the Izala, Tijjaniyya, Qadiriyya and Shiite Islamic groups are pagans and his group will continue to kill their followers.

He also condemned the government Saudi Arabia.

"We will kill you people, we will capture hostages and keep selling some," he said.‎