Saudi air defence intercepted on Friday a ballistic missile shot towards border city Najran, Al Arabiya local news reported.
Saudi state media reported earlier Saturday that the kingdom-led coalition fighting the rebels since March 2015 killed two Shiite rebel leaders and dozens of their militiamen.
Meanwhile, three leaders of the Iranian-backed Houthi militia were killed on Al-Bayda front in central Yemen.
Al-Samad, who held the post of president in the Houthi-backed political body, was the most senior official to be killed by the Western-backed alliance, which had offered a $20-million United States reward for any information that led to Samad's capture.
The latest attack came as the Houthis staged a public funeral for a slain commander in the Yemeni capital Sanaa.
'Tsunami' of match-fixing in lower-level tennis, says report
In fact, according to the TIU's annual report of 2017, the numbers of prima facie "betting alerts" actually went down past year . The report surveyed over 3,200 tennis players and found that 14.5% indicated they had first-hand knowledge of match-fixing.
Tens of thousands of Yemenis mourners were attending the funeral of Saleh al-Samad on Saturday when the airstrike occurred. Houthi leader Abdul-Malek al-Houthi vowed to avenge al-Samad's death.
The rebels, known as Houthis, have previously fired missiles targeting the Saudi mainland, including the capital, Riyadh.
Colonel Turki Al Maliki, the spokesman for the Saudi-led coalition in Yemen, said the missile had been launched to target civilian and populated areas.
Yemen has been engulfed in a violent civil war between the government, headed by President Abd Rabbuh Mansur Hadi, and the Houthi movement.
The attacks came as newly appointed US Secretary of State Mike Pompeo was scheduled to arrive in Riyadh for talks that are expected to include discussion of the conflict in Yemen, in which almost 10,000 people have been killed since the Saudi-led alliance became involved. The blockade has since been partially lifted, but access to the impoverished country remains limited.