(CNN) — A group of FEMA workers has been reinstated after three months of forced leave and an investigation into alleged misconduct for signing an open letter to Congress that criticized the Trump administration’s overhaul of the disaster relief agency and warned it could put American lives in danger.

More than a dozen workers received reinstatement notices from the Federal Emergency Management Agency last week, according to multiple sources and internal emails reviewed by CNN. “The misconduct investigation has been closed, and as a result you are being removed from Administrative Leave,” one email said. Some of the staffers have already reported back to work, while others will rejoin their teams this week.

“I was dumbfounded,” said Virginia Case, a FEMA external affairs officer who w

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