For any passers-by, interested in Engineer's Houthi theory, here's a multi-linked primer:
https://www.bbc.com/news/world-middle-east-31645145
Caption under the photo: Ansar Allah's slogan is: "God is great. Death to America. Death to Israel. A curse on the Jews. Victory to Islam."
Ansar Allah (Partisans of God), which is also known as the Houthi movement, has experienced several major transformations in arriving at its current dominant position in Yemeni politics.
It began in the 1990s as a youth-orientated revivalist movement that wanted to defend the religious traditions of a branch of Shia Islam known as Zaidism.
By the 2000s, it was leading a stubborn military insurgency that enveloped tribal politics in the far northern governorate of Saada. Its objective was to defend itself and its allies against President Ali Abdullah Saleh's military.
When the Arab Spring began in 2011, Ansar Allah was a welcome supporter of the peaceful protests against Mr Saleh and actively participated in the National Dialogue that followed his fall. The group backed regional autonomy, respect for diversity, and the strengthening of a democratic state.
But as the interim government of President Abdrabbuh Mansour Hadi stalled in early 2014, Ansar Allah launched an aggressive military campaign in the north, defeating key military units allied to Gen Ali Mohsen al-Ahmar and the Islah political party.
This culminated in its descent upon the capital, Sanaa, in September 2014.
Ansar Allah was accused of a coup after announcing it planned to dissolve parliament in early February
Ansar Allah's stated aim was to install a more effective interim government to implement the outcomes of the National Dialogue. But clearly, it also sought military dominance in the north.
In the last year, an alliance with its former enemy, Mr Saleh, played a key role in transforming Ansar Allah into the dominant military and political force in the country.
For his part, the former president used the alliance with Ansar Allah to overthrow the Gulf-backed Hadi government and carve a more secure place for himself in future Yemeni politics.
Repression
The source of Ansar Allah's power is principally domestic and political, not religious.
The Zaidi "Sada" - those claiming descent from the Prophet Muhammad's family, and who played a special role in the regimes of the Zaidi Imams that ruled North Yemen for almost 1,000 years until 1962 - were discriminated against by the leaders of the new republican Yemen because they were perceived as a threat.
Many supporters of Ansar Allah adhere to a branch of Shia Islam known as Zaidism In the liberal period of the 1990s, some of the Sada emerged to search for a place for themselves in the republic. They formed two political parties, al-Haqq (Truth) and Ittihad al-Quwa al-Shaabiyya (Union of Popular Forces).
Al-Shabab al-Muminin (Believing Youth), the predecessor of Ansar Allah, was meanwhile founded by Hussein al-Houthi to revive Zaidi tradition in the face of effective proselytising among the young by Saudi-backed Wahhabis and local Salafists.
But it was the attack of the Saleh regime on al-Shabab al-Muminin that propelled the movement to the fore of Yemeni politics.
Hussein al-Houthi challenged President Saleh's legitimacy by claiming that he was weak and beholden to the United States and its "War on Terror".
In the context of the US-led invasion of Iraq, he chanted: "Death to America. Death to Israel. Curse the Jews. Long live Islam in the Grand Mosque of Sanaa." However, the target of the chant was Mr Saleh, not America or Israel.
