Group plotted chemical attack during Rio Olympics

The men allegedly discussed a plan to contaminate one of Rio de Janeiro’s water reservoirs to attack the Games, according to court documents reviewed by NBC News.

It doesn’t appear any of the most, if not all, members of the group knew each other aside from conversations online and messaging apps, according to the documents.

One suspect, posting under the alias Alisson Mussab, allegedly said on Telegram: “Have you imagined a biochemical attack, contaminating the water of a water station?”

The documents don’t indicate any chemicals, weapons, or bomb-making materials were found, but members of the group allegedly distributed recipe for gunpowder and instructions to make homemade bombs, according to court papers.