Heavily armed with tanks and machine guns, Boko Haram says it has created an Islamic caliphate in Gwoza, a town in northeastern Nigeria.<br/> <br />The announcement was delivered via a video message, by the Islamist group's leader, Abubakar Shekau.<br/> <br />(SOUNDBITE) (Hausa) BOKO HARAM LEADER, ABUBAKAR SHEKAU, SAYING:<br/> <br />"We didn't do it on our own, Allah used us to capture Gwoza, Allah is going to use Islam to rule Gwoza, Nigeria and the whole world."<br/> <br />Earlier this month, Boko Haram fighters stormed the town, spraying the streets with automatic gunfire and killing any who resisted.<br/> <br />The military has struggled to stamp out the Boko Haram fighters, who for five years have terrorised Nigeria in their effort to seize territory.<br/> <br />The insurgency has been in the international spotlight since Boko Haram kidnapped more than 200 girls from a school in April.<br/> <br />The girls are still missing, and despite being regarded as Nigeria's greatest security threat, Boko Haram appear as stro
