Filmmaker: Xavier Muntz
Since 2010, people in northeastern Nigeria have lived in constant fear of being attacked.
In the past years, Nigeria's rebel group Boko Haram  has repeatedly attacked schools, churches, mosques and markets, but state institutions such as police stations and military facilities have remained primary targets.
The group provoked global outrage in April 2014 when they kidnapped 276 schoolgirls in Chibok, northeastern Nigeria. The kidnapping received global condemnation and sparked the solidarity campaign #BringBackOurGirls.
In August 2016, Boko Haram split into two factions after long-time leader Abubakar Shekau rejected an attempt by ISIL's Abu Musab al-Barnawi to replace him. Al-Barnawi is believed to be the son of late Boko Haram founder Mohammed Yusuf and used to be Boko Haram's spokesman. Sporadic fighting broke out between the two factions, one headed by Shekau and the other by al-Barnawi and some believe that the division could break the spine of the Nigerian rebel group.
Since the start of the insurgency, the violence has resulted in more than 32,000 deaths and over two million people displaced.
But how did Boko Haram emerge and rise to power? What motivates them and why do they continue to thrive?
This documentary explores the origins and ideology of the rebel group and its bloody rise to power.
Some of the 21 Chibok schoolgirls released by Boko Haram during their visit to meet President Muhammadu Buhari In Abuja, Nigeria  [REUTERS/Afolabi Sotunde TPX IMAGES OF THE DAY]

Mohammed Yusuf and the origins of Boko Haram

Boko Haram, also known as Jama'at ahl al-sunna li-da'wa wa-l-qital, was established in 2002 in the town of Maiduguri, northeastern Nigeria, by  32-year-old  Mohammed Yusuf.
Yusuf set up his own mosque in a run-down neighbourhood ... People were intrigued ... There was a lot of curiosity in this radical rejection of the Nigerian state ... It was packed with people ... Yusuf fed the orphans and the street children. It became more than just a mosque.
Marc-Antoine Perouse de Monclos, professor at the French Institute of Geopolitics
With the return of democracy in 1999, Nigerians hoped for an end to widespread corruption within the elite and for fairer distribution of wealth.
To bring an end to corruption in politics, the Muslim majority in the north of the country wanted to see Islamic law applied more strictly. And Boko Haram took advantage of this popular demand.
"He [Yusuf] was quite a gifted preacher who became very popular because he was a good orator. And above all, he was a political preacher. It was that which spoke to his followers, the people of Borno. He talked a lot about lies... because for him, the politicians were liars," says Elodie Apard, French Research Institute for Africa.
Yusuf's message quickly resonated with people in the Borno region where the level of poverty was as high as 69 percent in 2011.
Nigeria is the leading economic power in Africa, but more than half of its population lives below the poverty line. Plagued by corruption, which is endemic among Nigeria's elite, politicians have gradually lost the trust of the people.
"Poor people identified with this [Yusuf's] discourse because they were promised paradise. They promised an Islamic state with Shariah, which is a form of social justice. Then the rich would no longer siphon off public money. They joined this group because they believed it would improve their lives through the more rigorous practice of Islam," explains Marc-Antoine Perouse de Montclos, pr