Already in control of Sanaa since September 21 and the strategic port city of Hudeida since yesterday, the rebels on Wednesday appeared to have taken control of two more provinces, Dhamar and Ibb, security officials said.
Just as in Sanaa and Hudeida, the rebels faced no opposition as they entered the two provinces and set up checkpoints, the officials said.
The rebels, known as Huthi, have been taking advantage of a power vacuum in Yemen to seize control of significant areas, threatening the authority of the Sunni-led central government, a key ally in US efforts to combat Al-Qaeda.
Deadly fighting broke out Tuesday when the Huthis tried to expand out of the town of Rada in central Baida and clashed with Al-Qaeda militants, who are active in several provinces.
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Five rebels, six suspected Al-Qaeda militants and a civilian were killed during the fighting in Rada, a security official and tribal sources said today.
Officially known as Ansarullah, the rebels stretched their control to the shores of the Red Sea on Tuesday, seizing control of Hudeida hours after a new premier was named in a bid to defuse the country's political crisis.
Military sources had previously warned that the rebels were looking to take control of Hudeida and to extend their presence to the narrow Bab al-Mandab strait, which leads to the Suez canal.
Bab al-Mandeb, only 40 kilometres (25 miles) across the water from Africa, carried an estimated 3.4 million barrels of oil a day in 2011, according to the US Energy Information Administration.
Today, groups of rebels advanced on the route linking Hudeida with the commercial seaport of Al-Mukha, just north of Bab al-Mandeb, security sources said.