Boko Haram's 'relentless' territorial violence

The Nigerian military has said it is attempting to retake a strategic town in the north-east of the country following a series of attacks by Boko Haram.

Hundreds of people were killed last week during the capture of the town of Baga in Borno state.

On Sunday, two female suicide attackers killed four people in the town of Potiskum.

A day earlier, another female suicide bomber struck in the main city of north-east Nigeria, Maiduguri, killing at least 19 people.

Will Ross reports.