Prince Hamza Bin Al-Hussein (right) and Prince Hashem Bin Al-Hussein attend parliament session in Amman. File/AP
Videos posted online showed a heavy police deployment in the Dabouq area near the royal palaces on the edge of Amman, while former crown prince Hamzah Bin Hussein said he was confined to his home.
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In a video the BBC said it obtained from his lawyer, Prince Hamzah said several of his friends had been arrested, his security detail removed and his internet and phone lines cut.
The official newspaper Al-Rai on Sunday warned that Jordan's "security and stability" were a "red line that must not be crossed or even approached", and said an official statement on the events was expected later in the morning.
Official news agency Petra named former close aides to the royal family Bassem Awadallah, chief of the royal court in 2007-2008, and Sherif Hassan bin Zaid among an unspecified number of suspects arrested.
The pair were detained for "security reasons", Petra said, quoting a security source.