Federal officials warned the Democratic National Committee that its network had been breached months before the party attempted to resolve the problem, according to a new report.

The comments came from an unnamed person briefed on the incident speaking to CNN. However, the person said, the warning was too vague for the DNC to understand, which meant the party failed to act until additional indications of an intrusion surfaced. The party then retained cybersecurity firm CrowdStrike, which investigated and said it had ejected the intruders by mid-June.