(PIX11) -- ISIS may have just killed American journalist James Foley, but the Islamic militants have been planting seeds of terror on the Internet days and weeks before the horrific act was released to the world.
The hashtag #AMessageFromISIStoUS has been circulating throughout social forums on the heels of the U.S. air strikes on ISIS forces in Iraq. The gruesome images of Foley's beheading has been a staple in the posts using the hashtag.
The back-and-forth of social media hatred shows that Americans are also participating in the heated exchange, posting altered images of Islamic religious leaders having sex with animals and images of U.S. firepower, mostly reacting to Tweets that show the ISIS flag in front of the White House.
But, one Tweet is especially alarming.
A picture posted on Twitter on June 30 shows 307 N. Michigan Ave. in Chicago, on the corner of Michigan and South Water Street, called the Old Republic Building. The apparent message in the photo reads: "soldiers of the Islamic state of Iraq and Syria will pass from here soon."
Other tweets show pictures saying: "We are in your state. We are in your cities. We are in your streets. You are our goals anywhere."
We are in your state
We are in your cities
We are in your streets
Security at the Old Republic Building declined to comment. WGN in Chicago didn't receive responses from the secret service, FBI or Chicago police.