A self-proclaimed commander of the Boko Haram sect in Maiduguri, capital of Nigeria's north-eastern state of Borno has announced a peace offer , even as the state was horrified by another brutal killing by militants of the sect.A self-proclaimed commander of the Boko Haram sect in Maiduguri, capital of Nigeria's north-eastern state of Borno has announced a peace offer , even as the state was horrified by another brutal killing by militants of the sect.