Yemen's Shia Houthi fighters have killed the governor of the capital Sanaa in clashes that erupted during an attempt to detain him, according to his relatives.
They said on Friday that Abdulghani Jamil and his nephew Nasr Jamil died of wounds suffered in clashes late on Thursday between his aides and the Houthis, they said.
Jamil was appointed by exiled President Abd-Rabbu Mansour Hadi, who fled to Saudi Arabia after the Iran-allied Shia Houthis seized power in Sanaa and later advanced on his last refuge in the south, the port city of Aden.
The Houthis "demanded Jamil hand himself in" but he refused, resulting in a firefight, relatives said.
Heavy fighting erupted in south of the country near Aden airport on Friday when local armed unit attacked Houthi fighters in a push to drive them from the district, residents and fighters said.
Arab coalition forces also made four air strikes on a military base near the airport, a source told Reuters news agency.
Saudi forces and the Houthis have been trading fire across the border since the coalition began its military operations.
On Thursday, two Saudi border guards were killed and five wounded by shells fired from Yemen.
Earlier this week Houthi fighters suffered their first significant setback in the south in two months of civil war when local units ejected them from much of the southern city of Dalea, about 170km north of Aden.
In another development, Ismail Ould Cheikh Ahmed, the UN envoy for Yemen, arrived in Sanaa as part of a renewed push for peace talks to end Yemen's two-month old civil war.
UN-sponsored peace talks set to be held in Geneva this week have been postponed because of the heavy fighting.
According to the World Health Organization, the Yemen conflict has killed almost 2,000 people and wounded 8,000.