U.S. Army officials are withholding details behind the arrest of a 22-year-old soldier suspected of espionage, but they stressed Wednesday there is no connection with the case involving an Army analyst suspected of disclosing secret intelligence to WikiLeaks.

Authorities also said Spc. William Colton Millay didn't transmit any information.

Millay was arrested Friday at a barracks room at Joint Base Elmendorf-Richardson in Alaska. He is expected to be charged through the military justice system later this week.

Millay, a military police officer, is being held without bail at the Anchorage Correctional Facility.

Army Lt. Col. Bill Coppernoll said Millay's arrest is related to an ongoing investigation conducted by the Army and FBI.

Unlike the WikiLeaks case targeting Army analyst Bradley Manning, allegations about Millay do "not involve the transfer of data on computer networks," Coppernoll said.

"Also important to note is that because of the close coordination between Army Counterintelligence and the FBI, any information that might have been transferred was stopped," he said in an email. "Millay was being observed well before any damage could have occurred."

FBI spokesman Eric Gonzalez also declined to provide details.

Attempts to reach Millay's attorney were not successful.

Millay is assigned to the 164th Military Police Company. Most members of that company are on a yearlong deployment to Afghanistan that began in March, but Millay was in the company's rear detachment that stayed behind.