A statue of the Blessed Virgin Mary which seems to be crying tears of blood outside a Vietnamese Catholic Church in California has caused quite a stir.

Pilgrims and curious locals have been flocking by the hundreds to see the alleged miracle which has been taking place at Sacramento’s Catholic Martyrs Church.

The parish has asked the Diocese of Sacramento to step in and investigate the phenomenon which was discovered last Sunday by Ky Truong, who does maintenance at the church.

Parish officials say they each time they have tried to wipe the red liquid away, it inexplicably returns.

Sacramento resident Andre Nguyen told CBS channel 13 that "To me, personally, it is a miracle. You believe it or don't believe it, that's okay. But I strongly believe it."

The diocese has not yet commented on the situation.