On March 4, Dalian customs found seven mail boxes containing more than 60 kg of khat leaves, which contain amphetamine-like stimulant. It is illegal to plant, possess, sell or consume khat in China.
Addresses on the mail boxes showed the leaves were sent from Ethiopia to a university dormitory in Dalian, but they provided no details about the sender or receiver, the Dalian customs office said in a statement.
Local authorities have detained two foreign suspects, it added without giving details, state-run Xinhua news agency reported.
An inspector using an X-ray machine noticed it under a layer of black tea in the package, a statement from the bureau said.
It was the first time the cannabis strain indica had been found in a foreign e-commerce package.
Local authorities detained a suspect in early March and closed the e-commerce account used to import the cannabis, the bureau said.