The North Atlantic Treaty Organization (NATO) has revealed that there were about 2,500 serious cyberattacks on its computers in 2012.
NATO director Ian West said the organisations intrusion detection systems can handle around 147 million suspicious events per day.
West was quoted by Reuters as saying that, "The worst case scenario of a cyber attack for us could be loss of life ... If intelligence doesn't get through about an ambush, if notification doesn't get through about a security situation, then our troops' lives are at risk."
He said hackers succeeded is some attacks against NATO's computer networks but declined to say whether they had access to confidential information.
Last month, NATO members have agreed to strengthen the alliance's cyber defence capabilities to protect all the networks owned and operated by the organisation.
NATO has also agreed to send an expert delegation to Libya to identify how it could best respond to the request by the Libyan Prime Minister on the development of the country's national security forces.
In May this year, the US Defense Department (DOD) claimed that the Chinese government and military organisations have targeted US government computers to exfiltrate information.
China however has criticised the report said the US is the real hacking empire.