Level 3 Blocks Chinese Servers Linked to Hacking

Level 3 Communications Inc. has cut off data from reaching a group of servers in China that his company believed was involved in an active hacking attack. The Broomfield, Colo., company is taking an aggressive -- and some say risky approach -- to battling criminal activity. Risky because hackers often hijack legitimate machines to do their dirty work, raising the risk of collateral damage by sidelining a business using the same group of servers.