Authorities say they seized $14 million worth of heroin during a traffic stop in Queens Tuesday night.

Drug investigators were in the area of Northern Boulevard and 84th Street in Elmhurst when they saw two pickup trucks driving in tandem, with a hitch trailer attached, law enforcement officials said.

The trucks had North Carolina license plates and were driving very slowly, and kept circling around a few blocks. 

Noticing the trailer's hitch was unregistered and the back tail light was out, the investigators pulled over the trucks, and officers found 48 kilograms of heroin pressed and concealed in the axle and in drive shaft parts in the bed of the truck, according to the officials.

Two people were arrested on a variety of drug charges. They're expected to be arraigned in Manhattan Criminal Court, authorities said.

The New York Drug Enforcement Task Force consists of the NYPD, DEA and state special narcotics prosecutors.