Most computer services at the Oklahoma Corporation Commission remained offline Wednesday following a hacking attack early Monday, state officials said.

"We detected an attack and have engaged State CyberCommand and OMES (Office of Management and Enterprise Services) staff to protect and restart the systems," OMES spokeswoman Shelley Zumwalt said. "No sensitive data was compromised, either from the Corporation Commission or citizens."

The attack mostly affected the Corporation Commission's information technology systems, Zumwalt said. The commission website, email services and other network operations all were offline.

Zumwalt said she could not answer whether the office knew who was behind the attack.