Yemen's Houthi militia announced on Tuesday they had shot down a drone above the Harad city in the northwestern province of Hajjah, the Houthi-run al-Masirah TV quoted a statement by Houthi military spokesman as saying.

The Houthis said the drone "was believed to be made by the United States and belonging to the Saudi-led coalition forces in Yemen."

The coalition has made no comment yet.

The coalition-backed Yemeni government forces have been fighting the Houthi militia for nearly seven years, and Hajjah is among critical frontlines.

In February, the Houthi militia drove out the Yemeni government forces out of Harad, and has controlled large area of Hajjah.

The Houthis have recently intensified cross-border missile and drone attacks against Saudi Arabia and the United Arab Emirates. Most of such attacks were reportedly intercepted.

Yemen has been mired in a civil war since late 2014 when the Iran-backed Houthi militia seized control over several northern provinces and forced the Saudi-backed Yemeni government of President Abd-Rabbu Mansour Hadi out of the capital Sanaa.

The Saudi-led coalition intervened in the Yemeni conflict in 2015 to support Hadi's government.