aden salafist imam shoot dead gunmen early saturday aden southern yemen witness local officials say third kill salafist imam month sheikh adel al shehri imam mosque inmaa district west aden shoot head mosque morning prayers one claim responsibility three kill motive make clear ultra-conservative salafists back secession southern yemen major component breakaway southern army former aden governor declare council seek secession southern yemen referendum independence would announce soon say aden also dominate local force back unite arab emirates key member saudi-led coalition intervene yemen civil war 2015 restore president abd-rabbu mansour hadi power hostile toward islamists yemeni salafist imam kill aden source