Theo Audio is unverifiable, but if authentic, it would mark the first time.

Boko Haram has claimed an attack in Nigeria outside the northeast.

The group, whose name means Western education is forbidden, has waged an insurgency in the northeast since 2000 and nine.

More than 30,000 people have been killed since then, and in 2014.

The group kidnapped 200 girls from a school in the northeastern town of Chibok on Friday.

If the voice claiming to be Aboubakar Shekau is to be believed, they were also responsible for taking more than 300 boys from the government science School in Katsina state.

The audio offered no proof of the claim, but said the attack was carried out to discourage UN Islamic practices.

Analysts have warned that West Africa's porous borders mean other Islamist groups operating in the wider Sahel region could form alliances with jihadists.

In northeast Nigeria, meanwhile, parents can only wait on hope.

Zeinab Mohamed, 13 year old son is still missing.

E education is what they don't want.

The Children tohave, by God's willing, they will come back alive and continue their studies at home.

No more boarding school again.

E will never talk to the government because it's been three days now.

They have been promising that our Children will return home, but we don't see it happening.

Spokesman for the presidency, Police and Army did not immediately respond to requests for comment, but on Monday, the president's office said the government was in contact with the armed gang on negotiating the release off the students.