Jordan said on Sunday it had foiled a plot against the kingdom involving a half-brother of King Abdullah II, arresting at least 16 suspects it accused of "sedition" and alleging foreign complicity.

Prince Hamza Bin Al-Hussein (right) and Prince Hashem Bin Al-Hussein, brothers King Abdullah II of Jordan, attend the opening of the parliament in Amman, Jordan, on November 28, 2006. Photo: VCG

Hamzah bin Hussein - a former crown prince stripped of that title by Abdullah in 2004 - and the others had worked with foreign parties to "undermine the security" of Jordan, Deputy Prime Minister Ayman Safadi said. Washington, Gulf allies and the Arab League were quick to stress their support for Abdullah's pro-Western government, seen as an anchor of stability in the Middle East.

Egyptian President Abdel Fattah al-Sisi called the monarch to affirm Cairo's "full solidarity" with Jordan and express "complete support of the recent decisions [he] has taken to ensure the stability and security of the kingdom," according to a presidency statement.

Hamzah, 41, had Saturday released a video message via the BBC in which he accused Jordan's rulers of nepotism and corruption and charged that he had been placed under house arrest. He lashed out at Jordan's "ruling system," saying several of his friends had been arrested, his security detail removed, no internet and phones cut. 

He denied being part of "any conspiracy or nefarious organization," but said the country of 10 million people had "become stymied in corruption, in nepotism and in misrule" and that no one was allowed to criticize the authorities. Petra said among those arrested for "security reasons" were former close aide to the royal family Bassem Awadallah, chief of the royal court in 2007-08, and Sherif Hassan bin Zaid.