At least 21 killed in rush-hour blast in Nigerian capital

Burnt-out cars are seen at the scene of a blast in Abuja, June 25, 2014. REUTERS/Afolabi Sotunde

ABUJA (Reuters) - At least 21 people were killed when a suspected bomb tore through a crowded shopping district in the Nigerian capital Abuja during rush hour on Wednesday, police said, adding to the toll of hundreds killed in attacks this year.

It was not immediately clear who was responsible for the blast and no one claimed responsibility. However, militant Islamist group Boko Haram has increasingly targeted civilians in its bloody five-year insurgency.