A crop of new factions have emerged to claim responsibility for attacks on US and foreign interests, a move intended by Iran to deflect blame from hardline militias like Kataib Hizbullah, experts say.
The militia has destroyed homes of residents who have voiced opposition to its presence and has targeted hundreds of mosques.
US sanctions imposed on Arch Consulting, Meamar Construction and a senior Hizbullah official target the party's illicit financial activity.
The militia has recently lost thousands of fighters during battles with the legitimate government, amid calls on Yemeni parents to reject Houthi efforts to send their sons to the battlefields.
US sanctions on two former cabinet ministers over support to Hizbullah have shaken some of the party's backers in the business sector.
The Lebanese militia has pulled back more than 2,500 fighters, experts and military commanders as it faces increasing pressure, sources say.
As major social media networks shut down channels and pages affiliated with ISIS, the group has tried to exploit lesser-known platforms.
Yemeni Minister of Information Muammar al-Eryani says the Houthis manufactured the mines under the supervision of experts from Lebanese Hizbullah and Iran's IRGC.
According to a new report, the Hizbullah member convicted over the Rafic al-Hariri assassination was part of a top-secret hit squad.
The bombing of a health facility and crucifixion of a dentist in al-Bayda province by AQAP militants last month have led to renewed calls to end the war in Yemen.