German police have shut down one of the world's largest illegal online markets in the so-called darkweb and arrested the three men allegedly running it, prosecutors said Friday.

The "Wall Street Market" (WSM) site enabled trade in cocaine, heroin, cannabis and amphetamines as well as stolen data, fake documents and malicious software.

The encrypted platform had more than one million customer accounts, over 5,000 registered sellers and more than 60,000 sales offers, according to Frankfurt prosecutors and affidavits filed by US prosecutors in federal court in Los Angeles.

"WSM operated like a conventional e-commerce website, such as eBay and Amazon. However, its sole existence was geared to the trafficking of contraband," US prosecutors said.