The missile, Zilzal-2, and Katyusha rockets targeted the gatherings in front of Alb border crossing.
On Thursday, a news agency affiliated to Yemen's Houthi Ansarullah movement said nearly 280 civilians had been killed and 300 others injured in airstrikes on Sa'ada province in the first half of 2018.
The victims included nearly 80 children and close to 40 women. Since the beginning of the Saudi war on Yemen in March 2015, which was launched in an attempt to crush Houthis and reinstall the former president, Abd Rabbuh Mansur Hadi, a staunch ally of Riyadh, Saudi warplanes have pounded the country day and night.
The Yemeni Ministry of Human Rights announced in a statement on March 25 that the war had left 600,000 civilians dead and injured until then.
