Kerry has said the US would support any state in the Middle East that felt threatened by Iran, and would not "stand by" if Iran destabilised the region.
The United States secretary of state, John Kerry has warned Iran over its alleged support for Houthi rebels in Yemen, BBC reports.
He further said that the US would support any state in the Middle East that felt threatened by Iran, and would not "stand by" if Iran destabilised the region.
Although Iran has denied accusations it is providing military aid to the Houthis, it dispatched two navy vessels to the Gulf of Aden, off the southern coast of Yemen, on Wednesday.
But Navy commander Rear Adm Habibollah Sayyari told state media the move was made with the aim of "safeguarding naval routes for vessels in the region".
In a chat with PBS Newshour, Kerry said "there are obviously supplies that have been coming from Iran. There are a number of flights every single week that have been flying in."
There has been intense fighting between the Houthi rebels and militiamen loyal to President Hadi, as the Houthi seek the removal of President Hadi who has since fled Yemen to Saudi Arabia.
Meanwhile, warplanes from the Saudi-led coalition have continued to bomb rebel targets across the country with a total of 560 people, including 76 children, having been killed in Yemen between 19 March and 4 April.
Another 1,700 people were wounded and 100,000 fled their homes.