WASHINGTON – The Army has detained a 22-year-old soldier in Baghdad in connection with the leak of a military video that shows Apache helicopters gunning down unarmed men in Iraq, including two journalists, defense officials said Monday.

Army Spc. Bradley Manning of Potomac, Md., now being held in Kuwait pending the results of an investigation, was the third suspected leaker known to have been apprehended under the Obama administration.

“This is a startling pattern for anyone who’s been watching the field for a while,” said Steven Aftergood, a director of the Project on Government Secrecy at the Federation of American Scientists.

Meanwhile, a convicted computer hacker from California claimed he alerted authorities about Manning after meeting him online, calling the young military analyst “a good kid who got a little mixed up.”

Army spokesman Lt. Col. Eric Bloom said Monday that Manning has not yet been charged.