Reuters report on an investigation into 'ghosting' (spoofing) in the foreign exchange options market for emerging market currencies

New York Attorney General Eric Schneiderman's office is investigating, said 'a person familiar with the matter'.

The person, who spoke on condition of anonymity, said subpoenas were issued last week to four brokerages: BGC Partners (BGCP.O), GFI Group, TFS-ICAP (IAP.L) and Tullett Prebon Financial Services (TLPR.L).

Reuters with more here

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Spoofing is the the posting of false bids and offers