(CNN) -- Custom officials have seized $12.7 million in heroin at the border crossing in Laredo, Texas -- the largest such seizure in the history of the port, they said.
The haul was discovered Sunday at the Lincoln-Juarez Bridge, the U.S. Customs and Border Protection said.
Officials founds 100 packs of heroin hidden in the roof of a bus driven by an Arlington, Texas, resident. The packs totalled 127 pounds and contained heroin with an estimated street value of $12.7 million, the agency said.
"As CBP's largest seizure ever made at the Laredo Port of Entry and the largest heroin seizure by CBP officers along the southwest border in the last five years, this is a stunning accomplishment and illustrates the substantial drug threat our frontline officers face at ports of entry throughout the nation," said Alan Bersin, the agency's commissioner.