A banner requesting the release of a prominent activist in the United Arab Emirates was flown over Manchester City's Etihad Stadium during their Premier League match with Liverpool.
Mansoor was jailed for 10 years in 2018 for "defaming" the country.
City owner Sheikh Mansour is the UAE's vice-president, deputy prime minister and part of the Emirati royal family.
The light aircraft towing the banner circled the ground for approximately 20 minutes after kick-off on Saturday.
In 2011, Mansoor was one of five activists arrested after calling for political or economic reforms.