By AJ VicensJuly 28 (Reuters) - A "coordinated cyberattack" targeted more than 30 community water systems in the U.S. state of Minnesota on July 26 and July 27, the state's IT ‌agency said in a statement. The agency, Minnesota IT Services, said it was not aware ‌of any active requests from Minnesota cities to have residents modify their drinking water usage, according to the statement, which comes ​a day after local media reported that four Minnesota cities issued notices about cyberattacks on their networks. Advertisement AdvertisementAdvertisement AdvertisementThe attacks are similar to a wave of cyber intrusions against U.S. water infrastructure that officials have in the past attributed to Iranian-affiliated hackers, raising concerns about the vulnerability of local utilities that serve millions of people. The Cybersecurity and Infrastructure Security Agency did not respond to a request for comment. Advertisement AdvertisementAdvertisement AdvertisementWhile it is not yet clear who is responsible for the attacks, Iranian-linked hackers have for years targeted U.S. water systems to varying levels of success.