The Vatican has been accused of harbouring a bishop wanted for alleged sex abuse offences, as Pope Francis railed against the evils of sexual exploitation on a visit to Thailand.

Prosecutors in Argentina have issued an international arrest warrant for Bishop Gustavo Zanchetta, who is accused of sexually abusing young trainee priests, known as seminarians. He denies the charges.

Bishop Zanchetta, 55, who is close to his fellow Argentine Pope Francis, lives in the Vatican.

Not only that, he reportedly resides in Casa Santa Marta, an accommodation block in the shadow of St Peter’s Basilica where Francis has lived ever since his election six years ago.