Police yesterday advised people to be on the lookout for fake banknotes after arresting two people in Athens who allegedly sold forged euro notes over the Internet. Officers arrested the unnamed 28-year-old man and his 24-year-old girlfriend after a complaint from the Bank of Greece and several internet users. The pair allegedly set up a website advertising forged 100-, 50- and 20-euro banknotes for sale. The website pictured the notes that the pair were selling so that customers could see for themselves how genuine they looked. It is not clear how many could be in circulation, as police continued efforts to learn how many people had bought the forgeries. The man has also been accused of listing items on Internet auction sites and bidding using different aliases in order to up price levels, police said.