Yemeni demonstrators marched with national flags, banners, and placards, denouncing attacks from a Saudi-led military coalition, backed by the United States.
The anti-US campaign, which was declared by the Ansarullah Houthi movement much earlier, was marked publicly after the group took control of Sana'a from the Saudi-backed government, around four years ago.
Since March 2015, Saudi Arabia and some of its Arab allies have been carrying out airstrikes against the Houthi Ansarullah movement in an attempt to restore power to fugitive former president Abd Rabbuh Mansour Hadi, a close ally of Riyadh.
Over 14,000 Yemenis, including thousands of women and children, have lost their lives in the deadly military campaign.