NEW : Yemen 's instability is rooted in grass-roots political and economic grievances , but the country 's instability concerns the West . Unrest reported in Taiz , Sanaa and Hodeida . The Yemeni government has been under pressure from the Houthi rebels for months to step up its fight against them. UNICEF voices concern over children 's deaths .
NEW : Unrest reported in Taiz , Sanaa and Hodeida . The Yemeni government has been under pressure from the Houthi rebels for months to step up its fight against them. UNICEF voices concern over children 's deaths .