143 dead after bomb attacks in northern Nigerian city

At least 143 people have been killed in a single day of co-ordinated bomb and gun attacks in a northern Nigeria in one of the bloodiest days in the country's growing sectarian conflict.

The Islamic militant group Boko Haram claimed responsibility for the attacks on police stations and other government offices in the northern city of Kano on Friday. Violence between Christian and Muslim communities has escalated dramatically. Boko Haram was responsible for at least 510 killings in 2011.