Saudi warplanes on Saturday struck a rally in the Yemeni capital Sanaa, where people had gathered to support the Supreme Political Council.
Hundreds of thousands of Yemenis had gathered in Tahrir Square for the demonstration, when the Saudi aircraft bombed the nearby streets.
No casualties were reported.
The Supreme Political Council is a coalition between the Houthi Ansarullah movement and the General Peoples Congress party, led by former president Ali Abdullah Saleh.
The council was formed after peace talks in Kuwait ended inconclusively between the Houthis and the Saudi-backed delegation loyal to Yemens Abd Rabbuh Mansur Hadi, the president who has resigned and fled the capital.
The airstrikes were apparently meant to disperse the huge crowd.
During the demonstration in Sanaa the protesters denounced the legitimacy of the Hadi administration. They waved Yemens flags and chanted slogans such as, We will sacrifice our souls and blood for the sake of Yemen.
The demonstrators also carried placards with messages that read in Arabic, Reforms are the most efficient popular force in the face of enemies.
Nearly 10,000 people have been killed in Yemen since late March 2015, when the regime in Riyadh launched its deadly campaign against the impoverished country in an attempt to crush the Houthis and restore Hadi.