LAS VEGAS: O. J. Simpson was charged today with six felonies in connection with a reported armed robbery of some sports memorabilia in a Las Vegas hotel room on Thursday night, the Las Vegas police said..

Mr. Simpson was booked into the Clark County Detention Center and charged with two counts each of robbery with a deadly weapon and assault with a deadly weapon as well as one count each of conspiracy to commit burglary and burglary with a firearm, Lt. Clint Nichols of the Las Vegas police said. Bail was not set by early this evening, and an arraignment in Clark County District Court via video is expected on Monday.

Those are the same charges lodged against another member of a group of six, including Mr. Simpson, that are accused of storming into a room at the Palace Station Hotel and Casino a mile from the Las Vegas Strip at about 8 p.m. Pacific time on Thursday. That suspect, Walter Alexander, 46, of Mesa, Ariz., was arrested late Saturday and released early today on his own recognizance, according to his lawyer, Robert Rentzer.

The police are still seeking the other four.

It remains unclear exactly what property was taken and to whom it belonged.

"Having said that, the manner in which these properties were taken, we have a responsibility to look into that regardless of who the property belongs to," Lieutenant Nichols said. "We also have some information that the property that Mr. Simpson allegedly took was not his property.

"It included a lot of sports memorabilia and most of it and had been signed by Mr. Simpson himself along with some other property," Lieutenant Nichols said. "I believe there were some Joe Montana cleats, some signed baseballs and some other stuff."

Capt. James Dillon of the Las Vegas police said that investigators had confiscated two guns that might have been used in the Thursday incident in an early morning raid on two residences in Las Vegas.

Mr. Simpson, 60, was arrested at the Palms Resort Casino and taken to the Clark County Detention Center for processing about noon today. Police officials said that he would spend the night in isolation at the center.

Mr. Simpson has declared his innocence, telling The Associated Press in an interview that there had been no guns involved in what he described as a self-organized sting operation intended to retrieve some of his sports memorabilia.

Mr. Alexander, 46, of Mesa, Ariz., was arrested at McCarran International Airport and was charged with two counts of robbery with a deadly weapon, two counts of assault with a deadly weapon, conspiracy to commit robbery and burglary with a deadly weapon. Mr. Alexander was about to fly from Las Vegas to Los Angeles to meet with his lawyer, Mr. Rentzer.

Mr. Rentzer, who defended Rodney King on his traffic arrest in 1991, said Mr. Alexander had been released on bond around 4 a.m. today.

"I assured the authorities that we are not hiding and that he will be available to us," Mr. Rentzer said. "Until I can meet with my client and hear the facts of the case and determine my client's exposure, I refuse to discuss the prospects of plea bargaining."

Two memorabilia dealers, Alfred Beardsley of Glendale, Calif., and Bruce L. Fromong of North Las Vegas, Nev., told the police on Thursday that a group of men, including two with guns, entered Mr. Beardsley's room at the Palace Station around 8 p.m. and left with a trove of sports memorabilia. They said the items taken had included photographs and books signed by Mr. Simpson, lithographs of the former San Francisco 49ers quarterback Joe Montana and Mr. Beardsley's cellphone.

Mr. Beardsley and Mr. Fromong told the police that the group had been directed by Mr. Simpson.

In his interview with The Associated Press, Mr. Simpson gave a different account. He said that he and some acquaintances had left a cocktail party and gone to Mr. Beardsley's room, escorted by Tom Riccio, an auction house owner.

Mr. Simpson said he had pretended to be interested in buying the suit that he wore in court in 1995 when he was acquitted of the murders of his former wife, Nicole Brown Simpson, and her friend Ronald Goldman. The group left with Mr. Simpson's Hall of Fame certificate and a photo of J. Edgar Hoover, the former F.B.I. director, among other items, Mr. Simpson said.

"Everybody knows this is stolen stuff," Mr. Simpson was quoted as saying. "Not only wasn't there a break-in, but Riccio came to the lobby and escorted us up to the room.

"In any event," Mr. Simpson was quoted as saying, "it's stolen stuff that's mine. Nobody was roughed up."

Mr. Simpson was acquitted for the 1994 double murder, but he was found liable for the deaths in a civil case in 1997 and was ordered to pay the Goldman family $38 million and Ms. Simpson's family $24 million. To date, he has paid about $10,000 of the judgment, said a lawyer for the Goldman family, David J. Cook.

The Goldman family watched the case from afar with "cautious optimism," said Mr. Goldman's father, Fred Goldman.

"He deserves whatever he gets," Mr. Goldman said. "It's only satisfying that he's arrested. If he's convicted and sentenced to jail, it'll be that much more satisfying. But when all is said and done, he has still gotten away with murder and that's where he should've been punished, that's where he should have been found guilty and that's where he should've gotten the death sentence."

The incident leading to the arrests came the night before the release of "If I Did It," a book Mr. Simpson collaborated on with a ghostwriter that he said was a fictional account of how he might have committed the murders for which he was acquitted. The book, originally to be published by HarperCollins last year before an outcry prompted the company to cancel it, was repackaged by the family of Mr. Goldman to make money to pay down the civil judgment.

The Goldman family has been under criticism by members of Ms. Simpson's family for publishing the gory account. Ms. Simpson's sister, Denise Brown, appeared on Oprah Winfrey's talk show on Thursday to denounce it, and Ms. Winfrey agreed that its publication was distasteful.

Yet Mr. Goldman said the robbery arrest was another reason why he wanted the book published.

More O.J. Pieces by Steve Friess