Facebook Inc.and Twitter Inc.participated in a probe that resulted in the arrest of suspected militants inBrazilahead of the Rio Olympics, Reuters reported July 24, citing a judge overseeingthe probe.

Without providing additional details, Judge Marcos Josegreida Silva reportedly said in a weekly news program on the Globo televisionnetwork that the companies offered Brazilian authorities information related tothe "conversations and data about where those conversations were posted."

The news comes as Brazilian judge Daniela Barbosa Assunçãode Souza ordered five Brazilian carriers to suspend Facebook-owned WhatsApp indefinitely forrefusing to cooperate in a criminal investigation. The ban, however, waslifted by FederalSupreme Court President Ricardo Lewandowski.