"We were deeply troubled to learn of this incident, and very relieved to have it contained quickly," Chicago Election Board Chairwoman Marisel A. Hernandez said in a statement. "We have been in steady contact with ES&S to order and review the steps that must be taken, including the investigation of ES&S' AWS server. We will continue reviewing our contract, policies and practices with ES&S. We are taking steps to make certain this can never happen again."