The seizure of a large amount of performance-enhancing drugs in a raid by Yemeni law enforcement agents is "a landmark moment", the head of investigations for the World Anti-Doping Agency (WADA) has told AFP.

Gunter Younger said the operation, which netted 447kg of both narcotics and performance-enhancing substances, mainly amphetamines, showed authorities were increasingly tracking the cross-border trade of prohibited substances.

The raid -- one of several carried out including at sea -- sends "a clear signal to criminal networks that the landscape is shifting, that trafficking of performance-enhancing drugs is now on the radar of the authorities", Younger said.

WADA and the Yemeni authorities believe Syrian and Iranian drugmakers have switched their operations to Yemen since the fall

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