US faces cyber threats
Washington - President Barack Obama's top counter terrorism advisor says the US faces "serious and significant" cyber threats that could compromise national security.
John Brennan says the administration is taking steps to improve cyber security and looking at the matter from an espionage and terrorism point of view. He says national security is something that's at risk.
Brennan isn't naming any country or individuals possibly behind cyber attacks. He was asked on NBC television's Meet the Press about concerns that computer hackers in China have infiltrated computer networks.