Indifference, criminal networks and powerful economic interests still pose a challenge to those fighting against human trafficking, Pope Francis said.

While much has been done in recognising the seriousness and extent of this "true crime against humanity," he said, "much more needs to be done on the level of raising public awareness and effecting a better coordination of efforts by governments, the judiciary system, law enforcement officials and social workers."

The Pope spoke to more than 100 people taking part in the second assembly of RENATE - Religious in Europe Networking Against Trafficking and Exploitation on November 7.