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Stomper Anson noticed strange flashes of purple light in the sky at Yew Mei Green Condo, Choa Chu Kang North 6 yesterday (May 21) at around 2.45am.
This was despite there being no thunder or other sounds.
Anson said the light continued flashing for 20 to 30 minutes.
He asked, "What is this weird flashing light?"