The air raids were aimed at a site held by soldiers loyal to former Yemeni President Ali Abdullah Saleh, who have joined up with Iranian-allied Houthi rebels against local militias in the south, the source said.
Saudi Arabia and its Sunni Arab allies began air strikes against the Houthis more than two weeks ago, hoping to halt their advance towards the southern port city of Aden.
The campaign has raised fears that a sectarian proxy war between rivals Riyadh and Tehran will heat up and further destabilize the Middle East.