N'DJAMENA, Chad – Soldiers from Chad and Niger launched the largest international push to defeat Nigeria's Islamic extremists whose war has spilled over into neighboring countries, officials and witnesses said Monday. Chad's president has warned that the leader of Boko Haram must surrender or be killed.
At least 200 vehicles full of soldiers were spotted by residents crossing from Niger into Nigeria. Loud detonations were soon heard, signaling heavy combat with Boko Haram, said Adam Boukarna, a resident of the border town of Bosso, Niger.
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