By Brad Segall

READ MORE: Investigators Find Video Game Controller, Not Firearm At Armstrong Middle School After Reports Student Boarded Bus With Gun

BENSALEM, Pa. (CBS) — Police in Bensalem, Bucks County, say a drug bust has taken more than ten million dollars worth of narcotics off the streets of the Philadelphia area.

Police conducting a surveillance detail near State Road and American Drive on Sunday night saw a suspicious vehicle and decided to investigate.  They say two men drove off in the tractor-trailer with California registration plates, which was later stopped for a traffic violation.

Inside the truck, according to Bensalem public safety director Fred Harran, was 15 kilos of heroin and 20 pounds of methamphetamine with a street value of over $10 million.

READ MORE: Woman Finds Unknown Teen Suffering From Gunshot Wound Inside Her Home In South Philadelphia, Police Say

“We probably stopped a good load of drugs that were heading to the Delaware Valley,” he says.  “They were heading probably to this region, to the five-county area, for distribution: broken down and sold on the streets.”

Taken into custody were Esteban Velasco and Juan Nolasco, both of California.  They were being held in lieu of $1 million bail each.

Harran says there’s huge demand for heroin on the streets, and he believes his officers may have saved a lot of lives.

MORE NEWS: North Philadelphia Crash Leaves Young Girl Dead; Sister, Mother Injured