Employees at a northeast Calgary convenience store unpacked a surprise shipment last Friday — approximately $600,000 worth of heroin.

Now, the Calgary police guns and gangs unit is trying to figure out where the drugs — hidden inside a shipment of pre-made food — were actually headed.

Employees at the convenience store called police after they noticed suspicious packages within the shipment, which originated from California.

Fire and EMS were also called to help with the unknown substances.

Police found two clear, heat-sealed bags with the word "Navi" written on the outside.

Heroin 1

The heroin was discovered in heat-sealed bags. (Calgary Police)

Inside the bags they discovered 2 kg of what they believe to be heroin.

Anyone with information about the bizarre discovery is asked to call police or Crime Stoppers.