The Islamic State in Iran and Syria has accepted a pledge of allegiance from Nigerian terrorists Boko Haram who killed 10,000 people in the country last year.

The audio message entitled ‘kill and be killed’ and released through the militants’ vast social media channels was allegedly read by an ISIS spokesperson.

As well as welcoming Boko Haram’s loyalty, the speech also threatens further violence against Christian and Jewish communities according to News Week.

Speaking for his leader Abu Bakr al-Baghdadi, the man in the recording says: ‘We announce to you to the good news of the expansion of the caliphate to West Africa.

‘Our caliph has accepted the pledge of loyalty of our brothers of Boko Haram so we congratulate Muslims and our jihadi brothers in West Africa.’

He urged Muslims who could not join the fight in Syria to enter the conflict in Africa instead.

Nigerian President has claimed Boko Haram insurgents have already traveled to the Middle East to train with ISIS militants, according to Voice of America.