The spill, spotted at about 11am, is believed to have originated from a leaking hose at a factory’s palm oil storage facility, Luas said.

“The leak caused oil to spill into the drain at the premises, which flowed into the nearby canal.

“Based on checks at the location, no oil has entered Sungai Aur after the flood gate was closed,” it said in a statement, adding that the factory has closed temporarily and repaired the leaking hose.

Luas also instructed the factory to clean up the spill, while the fire and rescue department has installed oil booms in the canal to control the slick.

“Water quality samples taken by Luas have been sent to the chemistry department for further analysis and enforcement action, and an investigation paper under Section 79 of the Luas Enactment 1999 for polluting a water source has been opened,” it said.