Jordan's King Abdullah and former crown prince and half-brother Prince Hamza made their first joint appearance since a rift shook the country, attending a ceremony on Sunday marking 100 years of independence.

State media showed the monarch and other members of the royal family laying wreaths at the memorial to the unknown soldier and tombs of royalty in the Raghdan palace in Amman.

Hamza pledged allegiance to King Abdullah late on Monday following mediation by the royal family, two days after the military warned him over actions that it said were undermining Jordan’s security and stability.

On Wednesday, King Jordan said sedition had been quashed and Hamza was “under my care” with his family at his palace. But Hamza's absence after he appeared in a video on April 3 saying he had been ordered to stay at home had led to speculation about his whereabouts.

In announcing last week that the military had warned Hamza over his actions, the government said that Hamza had liaised with people linked to foreign parties seeking to destabilise Jordan and that he had been under investigation for some time.