Nigeria's President has declared a state of emergency after a series of attacks by Boko Haram.
 
Goodluck Jonathan vowed to crush the group as he visited the victims of a Christmas Day church bombing that left 37 people dead.
 
It will  mean the closure of the country's borders with Niger, Cameroon, and Chad.
 
Al Jazeera's Ahmed Idris reports from Abuja.

Source: Al Jazeera