There was no immediate claim from the Houthis, who despite the truce have continued their advance on Marib city, leading the coalition to launch air strikes in response.
The sources said Chief of Staff Lieutenant General Sagheer bin Aziz survived Tuesday's attack. One of his sons and a nephew, both officers, were killed along with five others, the sources said. Another of his sons confirmed this on Twitter.
The United Nations has been trying to hold virtual talks between the warring parties to forge a permanent ceasefire, agree a coordinated coronavirus response and restart peace talks stalled since late 2018.
The UN Office for the Coordination of Humanitarian Affairs (OCHA) said on Friday that the novel coronavirus is spreading throughout the country, which has limited testing capabilities and whose malnourished population has among the world's lowest immunity levels to disease.
Yemen has been divided between the Saudi-backed government in the south and the Houthi movement based in the north since the group ousted the government from power in the capital, Sanaa, in late 2014, prompting the coalition to intervene a few months later.
The government has reported 249 infections with 48 deaths from the virus while the Houthis, who hold most large population centres, announced four cases with one death, all in Sanaa.
OCHA has said actual numbers are much higher and that Yemen's war-ravaged health system has in effect collapsed.
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