A UFO left strange landing marks on the ground and burnt the grass during a harrowing close encounter with two terrified fishermen in Brazil.

These photos, which have never been made public before, show the strange indentations in the soil and grass flattened in a circular formation.

Bob Pratt's excellent book "UFO Danger Zone: Terror and Death in Brazil" is required reading for those interested in the history of UFO sightings in this area. To read more, click here.