COLOMBO, Sept. 7 (Xinhua) -- Sri Lankan police on Sunday discovered a large stock of raw materials suspected to be used in the production of crystal methamphetamine during a raid in Tangalle in southern Sri Lanka.

Tangalle police detected the materials during a search operation on Sunday morning. The seized materials were taken for further examination and investigation.

Police said the substances are believed to be used for producing crystal methamphetamine, adding that the chemicals appear similar to those seized earlier during a raid in Middeniya.

Sri Lankan police uncovered a stockpile of nearly 50,000 kg of raw materials suspected to be used in the production of crystal methamphetamine at Middeniya in southern Sri Lanka, the police said on Friday. ■