The Federal Bureau of Investigation (FBI) says it has cracked a major international cyber crime network after more than 90 suspected members of the ring were arrested in the United States. The suspects worked as so-called mules for fraudsters based in Eastern Europe who hacked into US computers to steal around $70 million. The police said more people were detained in Ukraine and the UK. The FBI said the arrests were part of one of the largest cyber criminal cases we have ever investigated.A US Attorney said most of those arrested in the US were charged with conspiracy to commit bank fraud and money laundering.