Three weeks of fighting across Yemen may be pushing a country where Sunnis and Shi'ites have prayed in the same mosques for centuries toward a sectarian war.
Most combatants deny they are motivated by religion in the conflict. Iran-allied Shi'ite Houthi rebels say they are leading a just revolution and Sunni Muslim Saudi Arabia contends it has been bombing the Houthis to protect the Yemeni state.
Militiamen from the south cite defence of their homeland.
But there are signs that the sectarian hatred that has engulfed the Middle East since the Arab Spring uprisings of 2011 is creeping into Yemen's war, fueled by a rivalry between regional powers Saudi Arabia and Iran
