(AP) — A Turkish group is claiming responsibility for a cyberattack on the city of Wichita’s website.

The cyberattack was reported on Internet sites two days before city officials announced it in a news release issued late Monday. Cyber War News says the Turkish Ajan Hacker Group is claiming responsibility. A message purportedly left by the group blames the United States for the chaos in the Middle East.

Wichita police told reporters Wednesday it appears a “sophisticated” individual hacked into the system, but they are not commenting about who may be responsible.

Authorities say they are trying to pinpoint the exact time hackers got into the system, how they got in, and who they are.

The city says hackers had potentially compromised the personal information of 29,000 vendors and employees.