UPDATED:: O.J. Simpson arrested in armed robbery probe

AS VEGAS, Nevada (CNN) -- Las Vegas police arrested O.J. Simpson on Sunday amid an investigation into an alleged armed robbery at a hotel in Las Vegas, Nevada, a source close to the investigation said.

O.J. Simpson was arrested Sunday amid an investigation into an alleged robbery at a Las Vegas hotel.

The charges he faces are unclear.

Simpson was arrested at his room in the Palms Casino Resort in Las Vegas, the source said.

On Saturday, Las Vegas police arrested a man and seized two guns in connection with the alleged armed robbery, the source said.

Simpson had already been questioned during the investigation into several items of sports memorabilia that were taken from collectors at a room in the Palace Station Hotel and Casino. Simpson has said the items belonged to him.

Walter Alexander was arrested Saturday night and charged with two counts of robbery with a deadly weapon, one count of conspiracy to commit robbery with a deadly weapon, two counts of assault with a deadly weapon and one count of burglary with a deadly weapon, the source said.

Alexander, a resident of Arizona, was arrested on his way to McCarran International Airport, the source said.

UPDATE O.J. SIMPSON ARREST

Just as the controversial book "If I Did It" is due to hit the book shelves, OJ is arrested by Las Vegas Police Department. Captain James Dillon says Simpson faces
charges including robbery with a deadly weapon, conspiracy to commit
robbery and burglary with a firearm.