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

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.

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.

Testing by authorities determined those balls were most likely the result of a sewage spill. In a post on Facebook on Tuesday, the Northern Beaches Council said they were alerted

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.

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.

Swimmers and surfers were urged out of the water on Tuesday afternoon after the white-grey, ball-shaped debris was found along Sydney's northern beaches.

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Several Sydney beaches, including Manly, were shut after debris resembling small white and grey balls washed ashore. Authorities are investigating the composition of the debris, which interrupts the summer holiday season's seaside activities.

It can also result in stumbling across mystery blobs of grease that concern environmental groups and prompt beach closures. According to The Guardian, several marble-sized balls have washed ashore on nine beaches located in Sydney,