Nigéria: Doze anos de Boko Haram

Boko Haram leader Abubakar Shekau has been designated a terrorist by the US government

• Founded in 2002
• Initially focused on opposing Western education - Boko Haram means "Western education is forbidden" in the Hausa language
• Launched military operations in 2009 to create Islamic state
• Thousands killed, mostly in north-eastern Nigeria - also attacked police and UN headquarters in capital, Abuja
• Some three million people affected
• Declared terrorist group by US in 2013        BBC