A Vietnamese woman caught with a suitcase containing 7.3 kilograms of heroin on Saturday in Hong Kong told police she was not aware of the bag’s contents and was only delivering it to someone.

The Vietnamese woman, who holds a Hong Kong identity card, is in police custody after being intercepted in the city’s Tuen Mun district on Saturday with a suitcase containing 7.3 kilograms of heroin worth about HK$5.1 million (US$651,100).

Police stopped the 42-year-old in a street in the district and arrested her for drug trafficking, but she insisted she was only “helping a friend to deliver the suitcase” and was unaware of its content.

Police mounted the operation after receiving information from an undercover officer. The focus of the investigation by the narcotics bureau was to find out if the woman was paid and manipulated by a cartel to carry the drugs as well as to trace the source of the heroin intercepted.

The Apple Daily cited a source as saying that the woman was lured by a hefty five-digit payment to deliver the case to another middleman. A police anti-narcotics superintendent told the media that the heroin was in compressed plate-like form and concealed inside a false compartment at the bottom of the suitcase.

He also warned that with the festive season now in full swing and black market demand on the rise, drug dealers are looking for people who need cash to deliver bags or cases. He appealed to members of the public to stay alert and avoid breaching the law.