Visitors to the Los Angeles County Board of Supervisors’ website were not met with the usual homepage on Tuesday afternoon. Instead, they saw a black screen with text in the middle, displaying what appeared to be pro-ISIS propaganda.

The website, BOS.LACounty.gov was hacked, just as government websites in four U.S. states had been hacked on Sunday and Monday.

Tony Bell, spokesman for Supervisor Kathryn Barger, said: “We are working with our IT security professionals to determine the cause and correct the problem as soon as possible.”

The page read, “You will be held accountable, Trump, you and all your people for every drop of blood flowing in Muslim countries,” with the bottom of the page reading “I love Islamic State.”

The page included a link to a Facebook page for a group called “Team System DZ,” implying responsibility for the hack.

It was not immediately clear who was responsible for the hack, or if it was genuinely affiliated with ISIS.

The Board of Supervisors’ website was taken down shortly after the hack and was still offline as of 2:18 p.m.

According to CNN, the FBI’s San Francisco field office is spearheading a federal investigation into the multi-state hack.

Visitors to BOS.LACounty.gov saw this instead of the usual homepage after a hack Tuesday afternoon.