Tens of thousands of people attended a giant open-air mass by Pope Leo XIV outside the Angolan capital Sunday, where he delivered a message of hope to the resource-rich country marked by poverty and inequality.

Leo flew to Portuguese-speaking Angola on Saturday, the third leg of a whirlwind four-nation African tour on which he has condemned corruption and the plunder of the continent's resources and had a high-profile spat with US President Donald Trump.

Around 100,000 people attended the pontiff's first mass in Angola at Kilamba, around 30 kilometres from Luanda, the Vatican said, citing local authorities.