Lille, France:
Disgraced former International Monetary Fund (IMF) chief Dominique Strauss-Kahn's legal woes deepened on Monday as French prosecutors opened a preliminary probe into accusations he took part in a gang rape in the US.
Prosecutors in Lille, where Mr Strauss-Kahn and three others are charged in a vice case, said in a statement the probe centred on an incident "that could be described as gang rape" that took place in Washington, DC in December 2010.
Mr Strauss-Kahn, two businessmen and a police chief have been charged with "aggravated pimping in an organised gang" in Lille for allegedly organising a prostitution ring for orgies in France, the United States and elsewhere.
Earlier this month Lille prosecutors said investigating magistrates in the case had submitted new evidence, based on testimony from two Belgian sex workers, that could also implicate the men in a gang rape.
Testimony from one of the prostitutes indicated that she had been forced into a non-consensual sex act while in Washington with Mr Strauss-Kahn and the other accused. She has not filed a complaint.
"I don't see the coherence of opening preliminary investigations for gang rape when the person concerned, who was questioned at length, did not file a complaint for rape," said one of Mr Strauss-Kahn's lawyers, Richard Malka.
He said the opening of the probe "shows the incredible relentlessness" of investigators against his client.
In a statement from his lawyers this month Mr Strauss-Kahn had denied the accusations, saying he "absolutely contests having committed the slightest act of violence of any nature whatsoever."
The former head of the IMF and one-time frontrunner for the French presidency, Mr Strauss-Kahn suffered a stunning fall from grace after his arrest last year on accusations he sexually assaulted a New York hotel maid.
The charges were eventually dropped but Mr Strauss-Kahn, 63, has since faced a series of criminal and civil actions in connection with alleged sex crimes.
The hotel maid, Nafissatou Diallo, has launched a civil suit against Mr Strauss-Kahn in New York seeking unspecified damages, while he has in turn filed a $1 million countersuit for malicious prosecution and defamation.
The pimping case in Lille centres on accusations that prostitutes were procured for sex parties attended by Mr Strauss-Kahn and paid for by executives who corruptly charged the parties to company expenses.
Mr Strauss-Kahn admits he attended a string of orgies in various cities, but insists he had no idea that many of the female guests were paid to attend, telling police in a reported interview that he may have been "naive".
After he resigned from the IMF and returned to France, Mr Strauss-Kahn also faced an accusation from 32-year-old author Tristane Banon that he had tried to rape her in 2002.
French investigating magistrates questioned Mr Strauss-Kahn and his accuser and concluded that, while there was prima facie evidence of a sexual assault, the alleged attack had occurred too long ago to be prosecuted.
Mr Strauss-Kahn, a longtime Socialist Party member and former finance minister, had been the frontrunner to run for the party against incumbent right-winger Nicolas Sarkozy in France's presidential election this year.
Following Mr Strauss-Kahn's legal troubles, former Socialist leader Francois Hollande emerged as the party's candidate and defeated Mr Sarkozy in the run-off vote on May 6.