Nine beaches in Sydney, Australia, have been closed after mysterious gray debris shaped like small balls washed up ashore. The discovery of the marble-sized balls comes just months after a similar incident in October of last year, where thousands of washed ...

All but one of the nine major north Sydney beaches which were closed this week after mysterious ball shaped debris washed up on the sands have now reopened.

Authorities in Australia say they have decided to shut nine beaches while they investigate the unusual grey and white balls.