“This was a difficult decision to take but necessary for successful delivery of the elections and the consolidation of our democracy,” commission chairman Mahmood Yakubu told reporters in the capital, Abuja.

Suspected Boko Haram militants killed at least 11 people including three aid workers in an attack on a military facility in Nigeria's northeastern Borno state late on Thursday, according to two security reports seen by Reuters.

British Prime Minister David Cameron has been caught on microphone saying that leaders of "fantastically corrupt" countries including Nigeria and Afghanistan will attend an anti-corruption summit in London.