Army chief Yusef Huneity earlier denied reports that Prince Hamza had been arrested. Army chief Yousef Huneiti did not specify what such actions were and denied reports that Hamzah had been arrested.
Hamza said in the video, passed by his lawyer to the BBC, that he was not part of any foreign conspiracy and denounced the ruling system as corrupt.
This is a very sad and unfortunate turn for a country that as I said used to be in the forefront of the region.
Petra, the official state news agency, reported that Sharif Hassan bin Zaid, a member of the royal family, and Basem Ibrahim Awadallah, a former head of the royal court who formerly served as finance minister and planning minister, are among those detained "for security reasons".
The official said the plot was "well organized" but it was not clear how close those allegedly behind the plan were to carrying it out.
King Hussein used to refer to Prince Hamzah as "the delight of my eye" and named him crown prince in 1999. But the authorities have become increasingly concerned with his efforts to build ties with disgruntled figures within powerful tribes.
Two people familiar with the situation told Reuters security forces had arrived at his small palace and begun an investigation. It gave no details.
This file handout picture released by the Jordanian news agency Petra on January 12, 2012 shows Prince Hamzah, half-brother of Jordan's King Abdullah, and his new wife Princess Basma Otoum (right) posing for a picture during their wedding ceremony at the Royal Palace in Amman. Egypt, Lebanon, Bahrain, Iraq, Kuwait and Qatar also stood by him. "King Abdullah is a key partner of the United States, and he has our full support", he said.
Gulf Cooperation Council "affirmed the full support of the Cooperation Council for all decisions and measures taken by His Majesty King Abdullah II Bin Al Hussein, to preserve the security and stability of brotherly Jordan, wishing brotherly Jordan continued security and stability under the leadership of His Majesty King Abdullah II and His Highness, the faithful Crown Prince", Secretary General Nayef Falah Mubarak al-Hajraf said in a statement on GCC's website.
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This comes after reports of a plot to unseat King Abdullah II.
Arrests of top officials and royal family members are rare in Jordan, seen as one of the Arab world's most stable countries.
Multiple countries, including Saudi Arabia and the United States, have expressed strong support for the king.
The tradition of the ruling Hashemite dynasty under the 1952 constitution gives the crown to the eldest son, but the monarch retains the option of naming a brother to be next in line.
King Abdullah has succeeded in bringing political stability to the country and gaining stature as a prominent Arab leader whose message of moderation has found an echo, especially in Western forums.
A proponent of economic reforms, Awadallah resigned as chief of the royal court in 2008 and has long faced stiff resistance from an old guard and an entrenched bureaucracy that flourished for years on government perks.
Since the start of the pandemic, the Jordanian intelligence agency has played a bigger part in public life.
Prince Hamzah, whose title of crown prince was rescinded by the king in 2004, went on to say: 'I am not the person responsible for the breakdown in governance, the corruption and for the incompetence that has been prevalent in our governing structure for the last 15 to 20 years and has been getting worse.