Several media reports have stated that at least three people were shot and wounded.
Most of Cyber Command's new troops will focus on defence, detecting and stopping computer penetrations of military and other critical networks.
The US army has appointed a senior general to direct and oversee its cyber warfare division. General Keith B Alexander has been entrusted with the Pentagon's new Cyber Command, the Guardian reported.
United States President Barack Obama knew that German Chancellor Angela Merkel's mobile phone was being tapped and personally approved the spying, which may have begun as early as 2002, a damning media report said on Sunday.
Bradley Manning, the United States army soldier who leaked a massive trove of secret US government files to WikiLeaks, was on Tuesday acquitted of the most serious charge of aiding the enemy but was convicted of several counts of espionage.