Who is expanding Al-Qa`dah's influence in Yemen?

"As Saudi Arabia’s allies try to bomb Islamic State out of its strongholds in Syria and Iraq, the kingdom’s war in Yemen is enabling jihadists to seize new ones. Al-Qaeda took over two cities in south Yemen on Wednesday, local media said." "The Houthis, the targets of Saudi anger after toppling a Gulf-backed government, have been effective fighters against jihadist groups in the past. As the rebels have been pushed back in southern Yemen, al-Qaeda-linked groups have taken control of territory, including the port of Mukalla in April. On Wednesday, the militants seized the cities of Zinjibar and Jaar in Abyan province, al-Masdar news website reported."