Sydney’s popular Manly Beach and other beaches around the Australian city were closed on Tuesday as authorities investigated marble-sized balls of white and gray debris that had washed on shore, in the latest such mysterious incident in recent months.

Nine beaches in Sydney, including the well-known Manly beach, were closed to swimmers on Tuesday after small white and grey balls of debris washed up on the shores.

Australian authorities have closed nine beaches in Sydney due to mysterious balls washing up from the ocean. These balls, consisting of an unknown substance, appeared on the beaches on Tuesday morning.

Beaches in Sydney, Australia, were closed to bathers after small white and grey balls of debris washed up on the shores at the height of the summer holiday season.

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.

Months after mysterious black balls forced the closure of some of Sydney's most famous beaches, small marble-like debris has begun washing up on the city's shores again. The balls - this time grey or white in colour - have prompted councils to shut nine beaches, including popular Manly and Dee Why, while authorities investigate.

The Northern Beaches Council said that efforts were underway to safely remove the debris. Meanwhile, Local authorities collaborated with the state’s environmental agency to investigate the matter.

Small white and grey balls of debris washed up on the shores at the height of the summer holiday season. Read more at straitstimes.com.

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

Mysterious balls appear on Sydney beachesNorthern Beaches Council