Source: Bloomberg

U.K. prosecutors are poised to arrest former traders and rate setters atUBS AG (UBSN), Royal Bank of Scotland Group Plc (RBS) andBarclays (BARC) Plc within a month for questioning over their role in the Libor scandal, a person with knowledge of the probe said.

Police, directed by Serious Fraud Office prosecutors, will act in the next month, said the person, who declined to be identified because the matter isn’t public. Arrests in the U.K. are made early in investigations, allowing people, who may not be charged, to be questioned under caution.