Experts say the cyber attack on the German Bundestag alleged began with the compromise of Chancellor Angela Merkels personal computer. The consequence of the data breach could be serious for the German Government, German media states that Bundestags may need to replace 20,000 computers after the intrusion. Despite the evidence suggests that Russia hackers were involved in the attack, the experts highlighted that the attribution in these cases is very difficult. Many other governments could be interested in the hacking of systems at the German.”]
Source: http://securityaffairs.co/wordpress/37831/cyber-crime/merkels-pc-bundestag-hack.html