Greek authorities have seized more than €500m ($561m) in amphetamines smuggled in containers shipped from Syria.
According to Reuters, Greek law enforcement found 33 million pills of Captagon — a brand name of the drug fenethylline hydrochloride — weighing 5.25 tonnes in three containers. Authorities are reportedly investigating the possibility the pills were destined for China.
"It is the largest quantity that has ever been seized globally, depriving organized crime of proceeds that would have exceeded $660m (€586.45m)," Greece's financial crimes unit said in a statement.
It is unclear what ship the drugs were seized from or at what port.
Captagon was developed in Germany in 1961 as a treatment for attention and sleep disorders.
More recently, the drug has become known as the "jihad pill" popular with militants from the so-called Islamic State to stay alert and dull pain. It is also popular among fighters in the Syrian Civil War and is said to be used recreationally in Saudi Arabia.
Over the last several years, law enforcement agencies across Europe have seized hundreds of thousands of Captagon pills.
