Mystery around SOS sign of boulders

The police in the Australian city of Kalumburu broke his head over a pile of stones, with which someone made the emergency call 'SOS'.

A helicopter pilot saw the international emergency cry SOS, made with stones, during a flight across the area and warned the emergency services.

The police have already been in the area to search for someone in need, but no one was found dead or alive. Even no trace of 'recent human activities'.

The question now is how long ago the emergency cry was done, whether there is someone who needs help or that it is possible to go a bad joke.

'We are looking for someone missing in this area,' the police, desperate looking for tips, writes on Facebook.