The pair were held as Libya rolled out a retaliatory response to the arrest of Moammar Gaddafi's son Hannibal in Geneva on July 15, including the alleged suspension of oil supplies to Switzerland on Thursday.
The Swiss nationals, one of whom is an employee of Swedish-Swiss firm ABB, have been formally arrested and charged with immigration offences, ministry spokesman Jean-Philippe Jeannerat said on Thursday.
They had been held in "unacceptable and very alarming" conditions since being detained on Saturday and the Swiss government had serious doubts about the Libyan allegations against the pair, Jeannerat added.
They are currently being kept in a small cell along with 20 other detainees. More...