MILAN (Reuters) - An Italian unit of Amazon is being investigated by Milan prosecutors for suspected tax evasion, two sources said on Friday, but the inquiry was not linked to a multi-million euro seizure from another of the group's Italian units this week.

Italy's tax police on Tuesday seized some 121 million euros ($131 million) from another unit of the U.S. e-retailer as part of an investigation into alleged tax fraud and illegal labour practices, prosecutors' documents showed.