Prime Minister Tun Dr Mahathir Mohamad on Tuesday stressed that the toxic pollution in Pasir Gudang shouldn't have recurred after the first incident in March.

Speaking to reporters after delivering his keynote address at the 33rd Asia-Pacific Roundtable, he said the government has to identify those responsible for causing the pollution and take stern action against them.

The latest incident of pollution in Pasir Gudang caused many to suffer from breathing difficulties and vomiting since last Thursday.