Medan, N Sumatra, Nov. 12 -- Police in North Sumatra are pursuing the suspected mastermind behind the trafficking of 76 kilograms of crystal methamphetamine seized in Asahan District last week, a senior officer said on Wednesday.

"We are expanding our investigation to arrest the main controller of the network," Asahan Police Chief Adjunct Senior Commissioner Revi Nurvelani said in a statement.

The investigation followed the arrest of two men, identified only as DGM, 37, and WR, 30, who were caught transporting the drugs from Silo Baru village toward Kisaran on Nov. 9.

During a raid in Bangun Sari Village, Silo Laut Subdistrict, officers seized four black bags containing 76 kilograms of meth.

Revi said the suspects told investigators t...