DUBAI (Reuters) — Hackers have attacked networks in a number of countries including data centers in Iran where they left the image of a U.S. flag on screens along with a warning: “Don’t mess with our elections”, the Iranian IT ministry said on Saturday.

FILE PHOTO: A man types on a computer keyboard in front of the displayed cyber code in this illustration picture taken on March 1, 2017. REUTERS/Kacper Pempel/Illustration/File Photo.