The Q Branch police arrested three persons and seized about one kg of narcotic substance, suspected to be Methaqualone, at Erwadi near here on Thursday evening.

Police sources said the seized ‘contraband’ had been sent to Madurai for chemical analysis. Two of the three accused were identified as Mansur and Kadhar, the source said. Preliminary interrogation revealed that the drug was supplied to the trio by a person in Kilakarai.

The source added that the arrest of this person could only reveal the source of the drug and whether it was meant to be smuggled to Sri Lanka.

After analysing the drug, the Q Branch sleuths are likely to hand over the case to the Narcotics Intelligence Bureau (NIB) for further investigation, the sources added.