Around 200 Chibok girls were abducted by Boko Haram in 2014. Some managed to escape while others were freed by the group in hostage deals with the government. But many are are still in captivity.
The Nigerian army said on Thursday it rescued one of the kidnapped Chibok girls amid a wave of deadly Boko Haram kidnappings and bombings rocking the country's northeast.
The army said troops found Salomi Pugo in the remote Pulka region of Borno state near the Cameroon border, without giving further details.
The abduction of more than 200 Chibok schoolgirls in 2014 by Boko Haram brought global attention to the insurgency sweeping through northeast Nigeria.
"Troops of Operation Lafiya Dole deployed in Pulka today rescued one of the Chibok girls abducted by Boko Haram terrorists earlier in 2014," Colonel Onyema Nwachukwu said in a statement.
"Currently the girl, who was intercepted in the company of another young girl, Jamila Adams, about 14 years old with a child, are in the safe custody of troops and receiving medical attention."
The @HQNigerianArmy troops of Operation Lafiya Dole, today rescued another Chibok Girl abducted by Boko Haram.— Bashir Ahmad (@BashirAhmaad) January 4, 2018
News of the rescue comes after weeks of relentless attacks by Boko Haram in the northeast, including the abduction of 30 loggers and a suicide bombing that claimed 14 lives at a mosque in Gamboru in Borno state earlier this week.
At least 30 soldiers are also missing following a Christmas Day attack on a military base in neighbouring Yobe state in which five troops were killed, according to military and militia sources.
In the aftermath of the Chibok kidnapping, dozens of the girls managed to escape.
Since then, others have been freed in hostage deals struck between Boko Haram and the Nigerian government, but many are still in captivity and some are feared dead.
Since 2009, the Boko Haram insurgency has spread from Nigeria into neighbouring Niger, Chad and Cameroon and affiliated itself with Daesh.
Despite the ongoing attacks, Nigerian President Muhammadu Buhari said in his New Year address that Boko Haram was "beaten".