Tinley Park Mayor Ed Zabrocki said police believe those involved in Saturday’s mob attack inside a local restaurant came from a group called Anti-Racist Action.

Zabrocki told the Chicago Tribune the police are examining the possible connection with the group and that they also believe the target of the attack was a gathering of white supremacists.

The Anti-Racist Action website posted a response Saturday to Patch’s coverage of the mob-style attack at Ashford House that officials say included 15 to 18 black-clad people that targeted a specific group. Eyewitnesses told Patch the attackers were armed with bats and hammers.

The website's post credited the attack to a group of “anti-fascists” who directly targeted the gathering.

Ashford House owner Mike Winston said the people who were attacked claimed to be an “Irish heritage association,” the Tribune reports.

Police said on Saturday five people were in custody in connection with the attack. A group of 15 people had fled in three different cars, one of which was stopped minutes after the attack.

The names of those in custody have not been released.

About 10 people were injured in the attack, police said. Three were hospitalized while the rest refused to be treated.