“Boko Haram’s horrendous abuses, unspeakable cruelty, total disregard for human lives, and wanton destruction of property are unmatched,” Dlamini-Zuma said in a statement after the bloc’s Peace and Security Council met late Thursday, ahead of a full AU summit meeting on Friday.

The Boko Haram uprising has become a regional crisis, with the four directly affected countries — Cameroon, Chad, Niger and Nigeria — agreeing along with Benin to boost cooperation to contain the threat and to form a Multinational Joint Task Force (MNJTF).

Boko Haram: Nigeria’s Islamist nightmare

L. Saubadu/G. Handyside, gil/jfs, AFP

“I am deeply concerned by the prevailing situation as a result of Boko Haram terrorist activities, including the recent escalation of violence witnessed on the ground,” Dlamini-Zuma added.

“The continued attacks in northeastern Nigeria and the increasing attacks in the Lake Chad Basin, along the border with Chad and Cameroon, and in the northern provinces of that country, have the potential of destabilising the entire region, with far-reaching security and humanitarian consequences.”

– ‘No efforts should be spared’ –

More than 13,000 people have been killed and more than one million made homeless by Boko Haram violence since 2009.

Regional nations pledged earlier this month to commit a battalion each to the force, a total of some 3,000 troops, but Dlamini-Zuma said after meetings Thursday it was decided that “no efforts should be spared” to defeat the fighters.

African Union Commission Chairperson Dr Nkosazana Dlamini Zuma speaks in Lagos

Nigeria, on December 3, 2014  Pius Utomi Ekpei, AFP/File

“Accordingly, it is recommended that the countries of the region be authorised to increase the strength of the MNJTF to up to 7,500,” she added, after the meeting at AU headquarters in the Ethiopian capital, where the two-day annual summit of the 54-nation bloc opens Friday.

Chad’s President Idriss Deby, who earlier this month sent a convoy of troops and 400 military vehicles into neighbouring Cameroon to fight Boko Haram, said action had to be taken.

“We have seen too many meetings and no concrete action,” Deby said.

“Today, there are four countries affected by Boko Haram, but tomorrow it may be a continental problem.”

Nigeria has the largest army in west Africa but has come under criticism at home and abroad for failing to stop the advance of Boko Haram.

Chadian soldiers watch as a vehicle from a United Nations’ High Commission for Refugees convoy heads to the UNHCR camp in N’Gouboua, in the Lake Chad region, January 27, 2015 Sia Kambou, AFP

Earlier this month Nigerian security officials ruled out the need for a United Nations or African Union-backed force to fight Boko Haram, saying the country and its partners could handle the threat.

But international pressure has ramped up, with a top US military commander General David Rodriguez, head of US Africa Command, warning this week that tackling Boko Haram will need a “huge” international effort.

The regional force will have the backing of the AU, and will ask for expected UN Security Council approval as in previous African-led forces such as those in the Central African Republic, Mali or Somalia, Dlamini-Zuma added.

“The people of the region have paid a heavy price to the scourge of terrorism, their plight has to be urgently brought to an end,” she added, highlighting the especial impact the insurgents have had on women and children, including the “ordeal of the girls kidnapped in Chibok” in Nigeria in April 2014.

A key task of the force, to be deployed with an initial mandate of a year, will be “conducting military operations to prevent the expansion of Boko Haram and other terrorist groups activities and eliminate their presence,” the statement added.