Update to this story.

Islamic State of Iraq and Syria, shows approximately 30 Ethiopians, who they identified as “followers of the cross,” being massacred in Libya.

The 29-minute video, entitled “Until It Came To Them—Clear Evidence,” begins with what is called a history of relations between Muslims and Christians, followed by footage of Islamists destroying churches, smashing gravesites and destroying religious icons.

A masked ISIS fighter brandishing a gun then appears and declares that Christians must either convert to Islam or pay a special tax, known as jizya, as outlined in Koran. For those who refuse, “we owe nothing except the edge of the sword,” he threatens.

“Muslim blood shed under the hands of your religions is not cheap,” the fighter states. “To the nation of the cross, we are now back again.”