Artillery shelling in Aden has killed 26 people, medical officials have said, as Houthi fighters and forces loyal to Yemen President Abd-Rabbu Mansour Hadi battled over control of the southern port city.

The deaths on Tuesday came as Saudi-led coalition fighter planes continued raids on Houthi positions, killing dozens across the country.

For the first time since the coalition operation began, jets bombed renegade troops in the Shia-populated city of Dhamar, a stronghold of the Houthis south of the capital Sanaa.

Huge blasts were heard overnight in Sanaa when coalition forces hit a missile depot belonging to the renegade Republican Guard, which is loyal to former President Ali Abdullah Saleh.