Nigerian soldiers have blocked roads out of a key northeastern city to deprive Boko Haram fighters of supplies in remote towns they control, the army has said.<br />The military said on Sunday that its offensive against the group, which followed a declaration of a state of emergency in three northeastern states, was aimed at re-establishing Nigeria's "territorial integrity".<br />Al Jazeera's Yvonne Ndege reports from Maiduguri.
