JOHOR BARU - The chemical plant in Pasir Gudang that was identified as the source of a chemical stench that engulfed parts of Singapore on Monday has been issued a stop work order by the Johor Department of Environment (DOE).

DOE director Datuk Dr Mohammad Ezanni Mat Salleh told The New Straits Times that the order was issued in the wake of a fire at the plant earlier this month.

"The order will be in effect until the plant completes necessary remedial actions. We will make sure that the plant complies with the order before allowing it to resume operations," he said.

Singapore's National Environment Agency (NEA) had contacted the DOE for assistance after the smell was detected by distressed residents on Monday. Subsequently, the foul odour was traced to the industrial facility in Pasir Gudang.

"The DOE… has traced the source… and is taking action against the operator," the NEA said.

Residents in Sengkang and Punggol had complained of an acrid, chemical stench that was later detected in areas such as Ang Mo Kio, Yishun, Seletar and Bishan. Thick smoke also hung over some of the affected areas, according to some residents.