The Hawthis waged a six-year insurgency that officially ended in 2010. The following year, an Arab Spring-inspired uprising shook the country, eventually forcing longtime President Ali Abdullah Saleh to step down as part of a U.S.-backed deal giving him immunity from prosecution.
Al-Hawthi said late Sunday a campaign of civil disobedience would begin Monday, "but it will not be about closing stores or groceries ... it will be a different kind." He didn't elaborate.
"If our demands are not met there will be decisive measures that we will talk about in time," he said.
Yemen, one of the Arab world's poorest nations, is facing multiple challenges. In addition to Hawthi rebels, an al-Qaida branch in the south poses a constant threat as it tries to impose control over cities and towns.
On Tuesday, al-Qaida militants shot three men dead in the southern province of Hadramawt, a security official said. Next to the bodies of the three men, he said, the militants left a statement describing them as "spies" for the United States who had been helping target al-Qaida militants for U.S. drone strikes.
"The spies sold their religion and themselves to the devil in return for money," the official quoted the statement as saying. "The Americans with their drones in the sky and those with their evil eyes on the ground," it added, warning others who cooperate with the U.S. that they would "face the same destiny."
The U.S. considers Yemen's local branch of al-Qaida to be the world's most dangerous, and has helped support Yemeni government offensives against it with drone strikes.
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