Visitors to governor.ohio.gov were greeted with a black background and an Arabic symbol while an Islamic call to prayer played in the background.
“You will be held accountable Trump, you and all your people for every drop of blood flowing from Muslim countries,” read the message on the Republican's homepage, which also carried a black background and the message, “I love Islamic state.”
Several other Ohio government websites were hacked, including those of the state's first lady Karen Kasich, as well as the Ohio Department of Rehabilitation and Corrections, the Department of Medicaid, and Casino Control Commission. In addition to the pro-ISIS language, a line appeared on each page that said "Hacked by Team System DZ."
It was not immediately clear who the group was -- or whether it was genuinely affiliated with ISIS.
Tom Hoyt, chief communications officer for Ohio's Department of Administrative Services, was among Ohio officials who confirmed the hack.
"All affected servers have been taken offline and we are investigating how these hackers were able to deface these websites," he told the Associated Press. "We also are working with law enforcement to better understand what happened."