Lieutenant Colonel Gabriel Olorunyomi "declined to say who was suspected of the attack." Why, it could be anyone! Doubtless it was armed Islamophobes mistaking Christians for Muslims.
"19 killed in attack on Christian church in Nigeria," from AP, August 7 (thanks to David):
Gunmen have shot dead at least 19 people in a Christian church in central Nigeria, according to an army official.
Lieutenant Colonel Gabriel Olorunyomi said the gunmen stormed a church building where worshippers had gathered to pray late on Monday in the town of Otite, near the city of Okene....
He declined to say who was suspected of the attack and there has been no claim of responsibility.
However, a radical Islamist sect has claimed several church attacks in Nigeria this year.