IMF chief Dominique Strauss-Kahn, who has been charged with sexual assault, has no diplomatic immunity, a police official says.
"He did not have diplomatic immunity," New York Police spokesman John Grimpel told Agence France-Presse.
Strauss-Kahn has been charged with the sexual assault and attempted rape of a 32-year-old chambermaid in the luxury Sofitel hotel near Times Square.
He is scheduled to enter a plea in court on Monday.
Grimpel said it was up to the judge whether the IMF leader would be freed on bail following his court appearance.
The veteran French politician, who was arrested at the weekend after a New York chambermaid accused him of sexual assault, will defend himself against the allegations, lawyer Benjamin Brafman told reporters.
"He intends to vigorously defend these charges and denies any wrongdoing," Brafman said outside the courthouse where the IMF chief will appear on Monday.
Strauss-Kahn left a police station in Harlem late Sunday (early Monday afternoon AEST) in handcuffs.
The bombshell news of his arrest has left the International Monetary Fund reeling, coming ahead of critical talks on repairing the painful fallout of the debt crisis sweeping the euro zone.
Lawyer William Taylor told journalists outside the Manhattan court house that "we've agreed to postpone the arraignment until tomorrow (Monday) morning."
Taylor said the delay was linked to Strauss-Kahn undergoing further testing by police searching for evidence.
"Our client willingly consented to a scientific and forensic examination," Taylor said, adding the IMF chief was "tired but he's fine".
Strauss-Kahn was taken off an Air France flight on Saturday just minutes before take-off in a humiliating turn of events for one of the world's most powerful men.
A former French finance minister, he had been expected to throw his hat into the ring for the 2012 French election, challenging President Nicolas Sarkozy.
Strauss-Kahn has been charged with a "criminal sexual act, unlawful imprisonment, and attempted rape" of a 32-year-old woman.
The woman, employed for the past three years at the luxury Sofitel hotel near Times Square, picked Strauss-Kahn out of a line-up on Sunday, as police said they had won a warrant to seek DNA evidence on his clothes.
The woman alleged he had assaulted her in his hotel suite when he got out of his shower naked. "She was in the room.
She thought it was empty. That's when he approached her from behind and touched her inappropriately.
He forced her to perform a sexual act on him," a police spokesman told Agence France-Presse.
He described the victim as "female, black, 32 years old," but could not confirm details given in the New York Times that the IMF chief pulled her into the bedroom and onto the bed and then locked the door.
She managed to fight him off, but he dragged her down the hallway to the bathroom, where he sexually assaulted her a second time, the daily said.
MSNBC television said that in the bathroom, Strauss-Kahn forced the maid to perform oral sex on him and tried to remove her underwear.
Strauss-Kahn's wife, high-profile French television journalist Anne Sinclair, said she did not believe the allegations against her husband, telling AFP: "I have no doubt his innocence will be established."
Strauss-Kahn, who has been widely praised for his stewardship of the IMF, is so well known in France he is often referred to simply by his initials DSK.
Even though he has not yet officially declared his candidacy in next year's French president elections, he had been topping the opinion polls.
News of his arrest threw the Socialist party into disarray, and could prove a boost for Sarkozy and his rightwing UMP which is also facing a challenge from the far-right National Front and its leader Marine Le Pen.
Conspiracy theories immediately began circulating in France speculating that the events were just an elaborate set-up to discredit Strauss-Kahn.
Police confirmed the IMF boss had been tracked down to the Air France flight when he contacted the Sofitel to ask staff to return his mobile phone which he had left behind in his room.
The arrest comes as the 187-member IMF is seeking to aid debt-ridden countries in the euro zone.
The IMF's executive board said it had postponed its executive board meeting until Monday in the wake of Strauss-Kahn's arrest.
Strauss-Kahn, whose stint at the IMF does not officially end until September 2012, had been due to meet with German Chancellor Angela Merkel in Berlin on Sunday to discuss an aid package for debt-laden Greece.
He was then to attend a meeting of EU finance ministers on Monday and Tuesday in Brussels.
The IMF said his number two John Lipsky would stand in as acting IMF chief for now. It is not the first time that Strauss-Kahn has been tainted by scandal.
In 2008, he was discovered to be having an affair with an Hungarian IMF economist, but the IMF concluded he had not exerted pressure on the woman, although it noted his inappropriate behaviour.
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