Saudi warplanes used toxic gas during Saturday's strikes on markets and civilian areas in Sa'ada, leaving a number of people injured and dead, Iranian media reported.
Those who were injured during the attacks said they have been suffering from suffocation, nausea and diarrhea since the start of the attacks.
The Saudi Arabia led coalition has been attacking Yemen for 24 days now to restore power to President Mansour Hadi, a close ally of Riyadh. The Saudi-led operation has so far killed over 2655 Yemenis, including hundreds of women and children. The attacks have also left thousands of people injured.