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If you were around Clarke Quay on Monday morning (Oct 2), you might have noticed that there was something not quite right about the Singapore River.
The iconic water body had an unusual greenish tint on its surface.
It seemed like the scene of a massive chemical spill, but the reason for the occurrence was, thankfully, nowhere as bad as that.
According to The Straits Times, the phenomenon was caused by the presence of algae.
Most algae are not toxic, but an algae bloom can kill fishes due to lack of oxygen.
The river's colour was back to normal on Monday afternoon after routine clean-up operations.
Take a look at photos of how the Singapore River looked like before it was cleared in the gallery above.