Chinese authorities last month seized 430 kg (948 lb) of cocaine at a port in the southern city of Shenzhen, acting on intelligence shared by the United States, in a sign of tentative progress in bilateral counternarcotics cooperation.

The drugs were discovered on Nov. 26 inside an international shipping container at Yantian port, state broadcaster CCTV reported on Tuesday. Authorities said the case remains under investigation but provided no further details.

Counternarcotics has emerged as one of the few areas of cooperation between Washington and Beijing amid heightened tensions over trade, technology and security. The seizure follows an agreement reached by the leaders of the two countries in October to strengthen collaboration on drug control.

The issue has been a priority for the United States, where President Donald Trump on Monday described illicit fentanyl as a “weapon of mass destruction,” underscoring Washington’s pressure on China to curb the flow of synthetic drugs and their precursors.