The girls have been missing since April 14, 2014, when they were abducted by Boko Haram.
The refugee camp hosts 50,000 people displaced by violence waged by Boko Haram.
The army has accused traders of "sustaining terrorism" by smuggling goods to the militant group.
Boko Haram have launched frequent attacks near Cameroon's border with Nigeria.
Authorities say the man had recruited three others to travel to Libya for training with ISIS.
Boko Haram may have pledged allegiance to ISIS, but the group is still undermining stability in West Africa.
Any soldiers found guilty of misconduct or human rights abuses will face a court-martial.
Boko Haram kidnapped more than 200 schoolgirls in April 2014.
Amnesty International says Mohammed may be responsible for mass executions.
Muhammadu Buhari is cracking down on corruption in the Nigerian government.
The Multinational Joint Task Force has failed to get off the ground since its creation in March 2015.
After Boko Haram in the northeast, a number of threats are destabilizing Nigeria's south.
The Nigerian president has excelled at tackling corruption but struggles with economic and security issues.
The militant group burnt the homes of villagers and killed scores near Maiduguri.
The government spokesman is accused of involvement in diverting $2 billion meant for fighting Boko Haram.
Members of Jonathan's government have been accused of stealing money earmarked for fighting Boko Haram.
Cameroon's Far North region has become a target for Boko Haram militants.
President Buhari has ordered that 20 retired and serving military officials be investigated for corruption.
Almost two years after their abduction, the Bring Back Our Girls group is marching on President Buhari's house.
The attack bears the hallmarks of Boko Haram, which has stepped up attacks in Cameroon.