While it doesn't say, I presume these revolutionaries are Muslim. Nigeria is about half Muslim and rioting Muslims killed 16 people yesterday, mostly Christians.
The Ibos in the south of Nigeria are mostly Christian, and the Hausa are the major Muslim tribe. These are the two large tribes who fought it out in the Nigerian civil war some years ago. It was called a civil war, but basically it was the usual case of bullying, ignoran Muslims attacking well-educated, hard-working Christians.
An article yesterday name the tribe of coastal pirates, and it was a name I didn't recognize, evidently a smaller group. But they certainly behave like Muslims, I agree.