Yemen's Shiite rebels say they've fired eight ballistic missiles at targets in Saudi Arabia's southern metropolis of Jizan.
In a televised speech, Houthi leader Abdul Malik al-Houthi vowed that the death of Samad - a relative moderate who helped oversee political and administrative duties while the Houthi military wing pursued fighting - would not split its ranks.
Al-Arabiya said the strike hit a building belonging to Yemen's Interior Ministry.
The rebels, who hail from northern Yemen, control Sanaa and much of the country's north - which borders Saudi Arabia - and the key Hodeida port on the Red Sea coast.
Saudi Arabia often claims that it intercepts incoming Yemeni missiles, but a close study of evidence by The New York Times past year clearly suggested that in one of the most high-profile of such Yemeni missile attacks, the projectile, launched deep into Saudi territory, had in fact landed unimpeded, bypassing American-made Patriot missiles and potentially other defenses used by Riyadh.
The Houthis have confirmed that an overnight attack took place but gave no details on casualties.
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Saturday's attacks came as newly appointed US Secretary of State Mike Pompeo was scheduled to land in Riyadh for meetings including talks on the Yemen conflict.
Tehran blames Saudi Arabia for the devastating Yemen war, which has seen millions struggle to secure food.
Saudi air defenses made a similar interception on Friday when Houthis filed a ballistic missile on the city of Najran in a deliberate act to target civilian and populated areas.
In Sanaa, Houthi supporters lined the streets Saturday for the funeral of Sammad and six others killed in last Thursday's strike.
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 Saudi-led countries engaged in the war on Yemen have also blockaded the already-impoverished country.