District Magistrate Harendra Narayan said that the substance in the syrup, which should have been within a 1 per cent limit, contained 48.6 per cent, making it highly toxic.

The CM also appealed to the Assamese community to help ensure the early return of key suspects currently in Singapore, saying their presence was essential for completing the probe.

The Madhya Pradesh government also filed a case against Srisan Pharmaceuticals, the company which manufactured the Coldrif syrup.