Sanaa, Yemen - A Houthi military adviser said on Wednesday that the rebel group will attack US interests in the Middle East if Washington intervenes in support of Saudi Arabia.

"If America dares to intervene militarily with its fleets or tries to take control of Bab al-Mandab [Strait], it is a red line for them and anyone else… we will fight over it," military adviser Abed Mohammed al-Thawr told AFP in an exclusive interview on Tuesday.

A Houthi blockade of the Strait of Bab al-Mandab has shaken Saudi Arabia, the world's top oil exporter, which was already hit by Tehran's stranglehold on the strategic Strait of Hormuz.

The pro-Iran Houthis dislodged Saudi-backed government forces from Yemen's Red Sea coast in fighting that left hundreds dead. Houthi drones and missiles have also targeted Saudi sites, including the capital Riyadh for the first time in years.

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Saudi Crown Prince Mohammed bin Salman requested help from President Donald Trump in fighting the Houthis, according to US reports.

The Houthis say Saudi Arabia has conducted hundreds of strikes in Yemen since fighting resumed in July, effectively ending a four-year truce.

"If America gambles on supporting Saudi Arabia with airstrikes or air support... We will consider any American interests around us to be targets and we will not exclude anything," Thawr told AFP, adding that they will "close Bab al-Mandab completely to American ships."

Thawr denied receiving directives from Iran, but said they are "one alliance and one body".

"Iran is a friendly, allied, and brotherly country to us, but it does not direct us. We are independent in our decisions and in our sovereignty," he said.

"As long as Saudi Arabia insists on and continues killing our country and striking our people, we will strike with an iron fist," Thawr said.