Killnet, a Russian-speaking hacking group that emerged shortly after Russia invaded Ukraine, took responsibility last week for deploying a denial-of-service attack that temporarily took several U.S. states’ websites offline.

Although reported as unsophisticated, the attacks managed to affect the websites of Colorado, Connecticut, Kentucky, and Mississippi. The group’s goal is reportedly to disrupt U.S. state websites for 72 hours. It reportedly previously attacked Bradley International Airport in Windsor Locks, Connecticut as well.