What's this unusual ring of smoke seen in the sky at Palawan Beach?

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Stomper Mk and her family observed this strange ring of smoke that looked to be 'hovering' in the sky yesterday afternoon (June 29), while they were at Sentosa.

A video she contributed shows the smoke slightly changing its shape before fading away.

Said the Stomper:

"Our family were at Palawan Beach in Sentosa yesterday and saw this ring of smoke hovering in the sky at around 4.30pm.

"Never seen anything like that before.

"It was hovering at a very low height so it cannot be from some airplane.

"Initially it was a full circle, but by the time we took our phones out to take a video, it became elongated before slowly disappearing

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