Fentanyl seizures by federal law enforcement inspecting goods and people attempting to enter the United States from abroad shot up over the past 12 months, more than doubling the record-high level confiscated a year earlier.

The surge in U.S. Customs and Border Protection seizures at the nation’s border is closely connected to the surge of drug overdose deaths occurring deep inside the U.S., which also hit a new high this year as a result of the prevalence of opioids.