Border Patrol agents seized nine pounds of methamphetamine from a passenger bus at a checkpoint, according to the U.S. Customs and Border Protection (CBP).

The incident happened at the Highway 86 checkpoint around 8:45 p.m. Tuesday.

During a secondary inspection of the passenger bus, a K-9 alerted El Centro Sector Border Patrol agents to the rear underside of the bus, CBP said.

Agents discovered seven bundles of methamphetamine inside an unmarked black backpack.

The drugs are worth an estimated street value of $30,600.

CBP said the drugs were seized and turned over to the Drug Enforcement Agency.

During the fiscal year 2017, the El Centro Sector has seized more than 1,019 pounds of methamphetamine, according to the CBP.