Boko Haram is said to have been defeated.

But the group continues to carry out attacks, killing people and driving millions out of their homes.

That has now prompted the government to invest additional $1 billion to keep fighting the terrorists.

Now, experienced American military officials are asking the Nigerian forces to change their tactics in the fight.

The US military officials said the soldiers battling the jihadists need a change of mindset to overcome an evolving guerrilla threat.

Boko Haram’s tactics — from improvised explosive devices to hiding within the local population — necessitate a shift away from conventional strategies, said Lt. Col. Sean Mcclure, the US Defence Attache in Abuja, on the sidelines of an African security summit.

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“We haven’t necessarily seen that kind of adaptation cycle. They’re trying to figure out how to do this. How they think in terms of combat, in my opinion, is still thinking of things as conventional warfare,” Mcclure told AFP.

He said that as the United States steps up its military presence in Africa, it hopes to share lessons learned in the Middle East with Nigeria and other countries in the Sahel fighting extremist groups.

The Sahel region is host to a string of Islamist groups including Al-Qaeda in the Islamic Maghreb in Mali and Boko Haram in Nigeria and the wider Lake Chad area.

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