The DHS reached this conclusion with "moderate confidence," according to the AP.
As China downplayed the severity of the virus, the country began increasing imports and decreasing exports of medical supplies.
The four-page DHS report stated that China merged trade figures for January and February and delayed the release of trade data in an effort to cover up the move.
The report reached the conclusion on the basis of the 95% probability that China's changes in imports and exports were not within normal range, according to the AP.
Secretary of State Mike Pompeo told ABC News on Sunday that the US could "confirm" China's government "did all that it could to make sure that the world didn’t learn in a timely fashion about what was taking place. There’s lots of evidence of that."