Swift action prevented another round of water disruption in the Klang Valley this morning after the waters of Sungai Gong near Rawang turned blue.

In a statement today, Selangor Tourism and Environment state executive councillor Hee Loy Sian said the Selangor Water Management Board (Luas)’s monitoring detected the blue-coloured contamination at 1am this morning.

The pollution had the potential to...