The officials said the rebels seized control of the city of Amran, about 45 miles north of the capital Sanaa, deploying fighters and vehicles at government offices, banks and shops.
Witnesses said fighters from the Hashid tribal confederation, one of Yemen's largest, allied with the country's Muslim Brotherhood group, the Islah party, were nowhere to be seen in the city.
In weeks of fighting, the tribesmen were backed by a local army unit. But the officials and witnesses said the rebel fighters did not storm or take over the military camps in the city.
The Shiite Hawthis were backed by other local tribes in Amran province, including disgruntled members of the Hashid and members of another large tribal confederation, Bakil.
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A spokesman for the Hawthi rebels, Mohammed Abdul-Salam, said his group had no intention of replacing the government in the city, adding that it is only fighting what he called an extremist group.
Fighting in Amran that raged for weeks left scores killed and forced families to flee the area. The Yemeni Red Crescent estimated that 15,000 families had fled the fighting.
Tribal leader Khaled al-Haidari, a member of the Bakil tribal confederation which fought alongside the rebels, said the city of Amran was celebrating the defeat of the Hashid fighters.
"Amran will celebrate today the fall of the corrupt tyrants," he said, adding that for years the province's dominant Hashid clan has been plundering its resources.
The Hawthis waged a six-year insurgency in the north against ousted President Ali Abdullah Saleh, which officially ended in 2010. But fighting has often reignited, and attempts at lasting cease-fires have repeatedly failed.