A gang of suspected drug-dealers in Amsterdam used a pair of fully-grown crocodiles to guard their loot, police say.

Police investigating the gang made the unexpected discovery this week, when they arrested 11 suspects, men and women aged between 25 and 55.

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They also seized 300,000 euros ($450,000) — the bulk of it locked in a cage with the toothy reptiles.

“It’s very unusual for (alleged) drug dealers to use crocodiles to guard their money,” said police spokesman Frans Zuiderhoek.

“I think they thought it was safer.”

Two crocodiles keep a keen eye on the cash. Supplied: Politie.nl

The suspects, including the owner of the crocodiles, were due to appear before a judge.

Police also seized large quantities of synthetic drugs, firearms and half a million euros’ ($765,000) worth of crystal meth in the haul.

The suspected dealers were delivering drugs to several hundred addresses, including to neighbouring Belgium, police said.

The crocodiles, for which the owner had a licence, were still in their cage and a friend of the owner was taking care of them.