Nigeria's military says it has retaken the north-eastern town of Bama from the Islamist military group Boko Haram.

A large number of militants were killed and a "mopping up" operation is continuing in the second largest town in Borno state, it said.
Boko Haram was reportedly also ousted from Goniri, its last base in neighbouring Yobe state.
The group wants to impose Islamist rule and recently joined the Islamic State militants based in Syria and Iraq.
More than 13,000 people have been killed since 2009.
More than 1.5 million people have been displaced by the violence.
The conflict has since spread to neighbouring countries, including Chad and Cameroon.