The supporters of Houthi rebels gathered outside UN offices in Sanaa and chanted slogans against Saudi Arabia and its royal family.
The rally took place a day after the Saudi-led coalition of Arab countries targeted a funeral procession in the Yemeni capital, killing at least 140 people and wounding more than 525.
Saudi Arabia launched an air campaign against Houthis in March last year. Riyadh accuses Tehran of backing the rebels, who have made significant territorial gains in the impoverished Middle Eastern country, capturing the capital Sana’a and ousting internationally recognized President Mansour Hadi.
“After this massacre, we are more determined to confront the assailants,” rebel chief Mohammad Ali al-Houthi told demonstrators. “Open the fronts with the Saudi enemy immediately,” he added, to which the crowd chanted anti-Saudi and anti-US slogans.