The Pope has stepped up the fight against corruption at the Vatican by strengthening supervision of financial transactions at its internal bank.
Pope Francis issued a decree designed to combat money-laundering and prevent any financing of terrorism.
It is the latest move to stamp out abuses at the Vatican bank, which handles funds for the Catholic Church.
The Pope recently set up a commission to investigate the bank and report back to him personally.
Last month the Vatican froze the account of a senior cleric, Monsignor Nunzio Scarano, suspected of involvement in money-laundering.