Boko Haram has freed two dozen hostages after a mass abduction by its militants in Cameroon, as Chad prepares to engage in the international battle against the extremist group.
Twenty-four of the 80 people taken hostage by Boko Haram in the north of Cameroon on Sunday were released as Cameroonian armed forces pursued the Islamist extremists, according to a government source.
The Boko Haram fighters then fled back into Nigeria, with the fate of the rest of the hostages taken in the raid, the worst of its kind to date, still unknown.
An army officer based in Cameroon's far north said Boko Haram had attacked two villages and kidnapped what Cameroonian state media said were 80 hostages.
Three people also died in the assault.
As the militants retreated, the Chadian army said it was putting 400 military vehicles, attack helicopters, and still unspecified number of soldiers amassed in northern Cameroon into action against Boko Haram, as part of what has become a regional effort to defeat the notoriously violent group.
"We are going to advance (Monday) towards the enemy," said Chadian army colonel Djerou Ibrahim, who is leading the offensive against Boko Haram, from the strategic crossroads town of Maltam in northern Cameroon.
"Our mission is to hunt down Boko Haram, and we have all the means to do that."
But Cameroonian Communications Minister Issa Tchiroma Bakary warned the armies of the two nations still had considerable planning to complete before being able to launch offensives against Boko Haram.
Chadian President Idriss Deby has clearly stated his determination to re-capture the strategic town of Baga in northeastern Nigeria, which Boko Haram stormed in murderous attacks in early January.
Witnesses recount terrifying scenes of violence - and the abduction by Boko Haram of what some said were more than 500 women and children - which French President Francois Hollande and US Secretary of State John Kerry described as "crimes against humanity".
According to Amnesty International, the attack of Baga was "the biggest and most destructive" by Boko Haram since it launched its campaign in 2009 to create a caliphate in the region, which observers say has claimed at least 13,000 lives and driven an estimated 1.5 million people from their homes.
Chad has thus far been spared attack by Boko Haram, but only a thin sliver of land in northern Cameroon separates the desert state from the Islamists' stronghold in Nigeria's Borno state.
Chad has also been affected by the refugee crisis sparked by Boko Haram's insurgency, and Deby has warned he will "not stand idly by" as the extremists enlarge their field of activity.
Nigeria, which has been unable to halt Boko Haram on its own, expressed its conditional support of Chadian soldiers eventually being deployed on its soil.
