India’s coast guard said Tuesday they had seized their biggest haul of illicit drugs when they stopped a fishing boat smuggling 5.5 tonnes of methamphetamine from war-torn Myanmar.

Axar.az reports that, citing AP, an Indian Coast Guard (ICG) reconnaissance air patrol spotted a small fishing boat in the Andaman Sea,which lies between India and troubled Myanmar, “operating in a suspicious manner.”

A coast guard vessel was sent out, with officers boarding at dawn Sunday when the fishing boat with a crew of six Myanmar citizens entered Indian territorial waters, the coast guard statement added.

“The boarding party found approximately 5,500 kilograms of prohibited drug methamphetamine,” it read. “The seizure is the biggest-ever drug haul by ICG, highlighting its commitment to safeguarding Indian territorial waters.”