The head of the training camp in Hajjah province, Amar al-Jarab, was among those killed in the strikes, the sources close to the Shiite rebels told AFP.
A warehouse where rockets were stocked was also hit, the sources added.
The raids come with the war-torn country plunged deeper into turmoil by Monday's killing of ex-president Ali Abdullah Saleh at the hands of the Huthis after his alliance with the rebels collapsed.
Forces of the Saudi-backed Yemeni government retook the Red Sea town of Khokha from the rebels on Thursday after clashes that killed dozens, local officials and medical sources said.
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Further east in the town of Hays and north in Tuhayta, rebels clashed with loyalists on Sunday, pro-government forces said.
Khokha lies between rebel-held Hodeida and government- controlled Mokha on the Red Sea, and is central to the government expanding its control over the strategic coastline.
The port of Hodeida is the main conduit for UN-supervised deliveries of food and medicine to Yemen, where poverty has been compounded by war and a blockade on ports and airports imposed by the Saudi-led coalition.
ICRC regional head of operations Robert Mardini called on all sides to protect civilians.
More than 8,750 people have been killed in Yemen since the Saudi-led coalition intervened in March 2015, to help the government of Abedrabbo Hadi Mansour fight the Huthis.
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