A ‘HAUNTED’ playground swing that rocks backwards and forwards on its own for days has scientists baffled.

Parents and children are convinced a ghost is to blame.

They were so spooked they reported the swing to cops after it began moving four months ago.

The phenomenon flummoxed police, who called physics professors into Firmat, Argentina.

But so far the experts have failed to find a logical explanation.

Locals claim the seat moves nonstop for TEN DAYS before stopping dead, while other swings remain still.

Teacher Maria de Silva Agustina said yesterday: “One child called it the Blair Witch Playground. We believe it is haunted.”

Academics have now ruled out magnetic and electrical fields, and winds – and called in ghosthunters.