Analysis: In Nigeria, Boko Haram follows in the footsteps of Iraq's Islamic State

Boko Haram has long wanted to carve out its own country in north-eastern Nigeria. It’s always been an improbable goal – until now. Emboldened by the successes in Iraq and Syria of the Islamic State, Boko Haram has changed its tactics and is closer than ever before to realising an Islamic state of its own. By SIMON ALLISON.