

'Highly trained agent': Chapman has also posted some less racy images of herself on her Facebook page.The flame-haired femme fatale: Anna Chapman, dressed in in brilliant red, at a party in New York in March. She is accused of being a Russian spy

The 'practised deceiver': Above left, Chapman in a photo from her Facebook page wearing her signature red dress. Above right, the accused spy in a racy pose also taken from her Facebook page

Accused: L-R, Anna Chapman, Vicky Pelaez, the defendant known as 'Richard Murphy', the defendant known as 'Cynthia Murphy', and the defendant known as 'Juan Lazaro' are seen in Manhattan federal court in New York last night
* Foreign Office investigating British passport claims
* Obama refuses to answer questions on arrests
* Putin says he hopes case will not damage U.S.-Russia relationship
* Man believed to be 11th spy nabbed today in Cyprus - then released on bail
* Accused allegedly used invisible ink and steganography
* Eight of the suspects were married couples, some with children
* Plot 'has been in place since the 1990s'
One of the women accused of being a Russian spy in the U.S. travelled on a British passport, according to the FBI.
Tracey Lee Ann Foley, who was posing as a naturalised U.S. citizen born in Canada, is believed to have been given forged British documents by her Russian handlers.
She used them to travel to and from Moscow with greater ease, the FBI has claimed.
The Foreign Office said today it was investigating the claim.
If true, itwill undo some of the work that Prime Minister David Cameron did during the recent G8 and G20 summits to improve relations with Russian president Dmitry Medvedev.