After decades, and controversy, the Vatican has authorized public worship at a shrine in Bosnia, where a once tranquil village has become a major pilgrimage site.

The Vatican said Thursday it recognised the shrine of Medjugorje in Bosnia-Herzegovina, without commenting on the Virgin's "alleged messages" to the faithful, who have gathered there in the millions for more than 40 years.

In June 1981, six children aged 10 to 16 claimed that the Virgin Mary appeared to them on a hilltop near the town.

The Vatican on Thursday gave the green light for Catholics to continue flocking to a southern Bosnian village where children reported seeing visions of the Virgin Mary, offering its approval for devotion at one of the most contested sites of Roman Catholic practice in recent years.

Pope Francis has approved a Catholic spiritual devotion centred in Medjugorje, a town in Bosnia that has been steeped in controversy over whether the Virgin Mary appears to local people, the Vatican said on Thursday.

The Marian apparitions in Medjugorje stir considerable controversy among the faithful and those outside the Church. Some are convinced of the authenticity of the events, while others have significant doubts.

Catholic worshipers who claim to have seen and spoken to the Virgin Mary at a Bosnian landmark received mixed messages from the Vatican on Thursday after the Church refused to say whether their visions were real — while still supporting worship at the site.