The photo taken on April 18, 2016, shows the cocaine seized by Shenzhen police. Seven suspects have been detained, five are from Hong Kong. [Photo: Chinanews.com]

Police in Shenzhen have cracked a cross-border drug trafficking case, confiscating 400 kilograms of cocaine and detaining seven suspects.

Police received a tip-off a month ago and then tracked the two suspects down with the help of surveillance video.

They say that information from the two suspects, led them to catch other alleged gang members and the discovery of more cocaine at their residence.

The police say all the suspects including five from Hong Kong in the drug trafficking ring, have been caught and evidence gathering is now underway.

According to the suspects, the cocaine was smuggled from South America by sea and was eventually destined for Hong Kong.

The value of the cocaine seized has been estimated at 350 million yuan.