SPOKANE, Wash. (AP) — The state Employment Security Department did not have adequate controls to prevent a slew of illegal unemployment insurance claims last spring that grew into the largest fraud in state history.

That’s according to a report from the Washington State Auditor on Friday. The audit provided the first accounting of the circumstances surrounding schemes that targeted Washington state’s unemployment benefits as the coronavirus pandemic was growing.

Key findings include that the “known and suspected” fraud loss, as of June 30, was about $600 million. This sum covers more than 122,000 known or suspected fraudulent claims.

But the state had recovered $250 million, resulting in an estimated net loss of $350.9 million.