[Updated at 11:46 a.m.] The U.S. military said Tuesday it is pressing criminal charges against Pfc. Bradley E. Manning, 22, for allegedly transferring classified data onto his personal computer and adding unauthorized software to a classified computer system.

Manning of Potomac, Maryland, is suspected of leaking a classified 2007 video of an Apache helicopter strike that killed 12 civilians in Baghdad, including two journalists from the Reuters wire service, the military said.

Manning was deployed with the 2nd Brigade, 10th Mountain Division, in Baghdad, Iraq, according to the military.

According to Wired.com, Manning leaked the video to the whistle-blower website WikiLeaks.com, which posted the video in April. Wired.com reported that Manning confessed to the leak in a series of online chats with a former computer hacker.

He allegedly owned up to leaking other items to WikiLeaks, including a classified Army document assessing the threat level of the website, according to the article, as well as State Department cables.