Yemen's internationally recognised government has ordered urgent action against individuals suspected of espionage, financing or supporting the Houthis, warning that those found guilty could face the death penalty.
The directive comes amid intensifying fighting across Yemen, with Saudi-backed government forces confronting Houthi advances near Taiz and a Saudi-led coalition conducting airstrikes in Houthi-controlled areas.
Yemen's Presidential Leadership Council instructed security, military and judicial authorities to strengthen protections for state institutions, national security and military secrets.
The council warned that individuals proven to have undermined the country's security, sovereignty or armed forces would face punishment under existing laws.
The measures coincide with mounting pressure on government forces around Taiz, where Houthi fighters have continued advancing despite a counteroffensive supported by Saudi airstrikes.
The Houthis have captured Mocha, west of Taiz, and territory along the Bab al-Mandeb coast, including Dhubab district.
Fighting has intensified around Jabal Sabir Mountain, a strategic position overlooking Taiz, as Houthi forces attempt to encircle the city.
Government troops are also engaged in fierce clashes south of Taiz, where losing control of the city would represent a major setback.
Explosions were reported in the Houthi-controlled capital, Sanaa, after the Saudi-led coalition announced preparations for a "special operation" and warned civilians to evacuate a targeted area.
Houthi-affiliated Al-Masirah reported strikes on oil facilities west of Sanaa, including a facility in the al-Sabaha area.
The precise extent of the damage remained unclear.
Houthi military spokesman Yahya Saree said the group's fighters were confronting Saudi-backed forces and warned that further attacks on Sanaa would trigger a severe response against Riyadh.
Separately, Houthi-affiliated outlets reported at least two airstrikes targeting Bani Muin and Bakil in Saada governorate's Razih district, near the Saudi border.
Saudi-led coalition spokesman Turki al-Maliki also announced that three drones had been intercepted north of Riyadh, highlighting the widening military confrontation.