Cyberattacks by North Korea have been found to cause Internet outages both the US and South Korea during the summer. The South Korea spy agency disclosed the IP addresses, leased from China and used by the North Korean Ministry of Post and Telecommunications.

The cyberattacks took place in July and consisted of denial of service, which imitates many computers attempting to access a single website or server simultaneously. This resulted in outages on major government-run websites in the US and South Korea., including the American White House and the South Korean’s presidential Blue House.

North Korea was the clear suspect from the beginning but no clear evidence was available until now. According to the South Korean media, the North has an Internet warfare division, employing up to 1000 experts for hacking into U.S. and South Korean military targets, designed for collecting sensitive data and interrupt service.