A general image of Abuja, the capital of Nigeria

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Nigeria's national security agency say Islamic extremist group Boko Haram were behind the proposed attack.

They said they had been planning to attack the US and British embassy in the city of Abuja.

Since 2009 Boko Haram have been carrying out an armed rebellion against the Nigerian government.

They have allied themselves with Islamic State (ISIS) who have supplied weapons and fighters to the group.