Abu Dhabi, United Arab Emirates (CNN) Authorities in Saudi Arabia have released the brother of a billionaire prince who was in detention for 11 months, according to social media posts by his immediate family.

Saudi Prince Khaled bin Talal is believed to have been in detention since January, though Saudi's state-run news agency did not have details on where he was held or what charges he was facing.

On Friday his sons and niece posted photos of the prince with family, congratulating him on his "safe return."

The prince is the brother of Prince Alwaleed bin Talal -- one of a group of royal family members and businessmen who were held in the lavish Ritz Carlton in Riyadh last year as part of an anti-corruption purge.

Alwaleed, who Forbes estimated had a personal fortune of $17 billion, was released almost three months later. The group paid over $100 billion in settlements for what Saudi authorities said were corruption charges.

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