A group representing 30 of the migrants who were flown to Martha’s Vineyard are demanding criminal investigations by the federal government and the state of Massachusetts.

Lawyers for Civil Rights, who are representing some of the migrants, sent letters to the U.S. attorney for Massachusetts and the attorney general of Massachusetts asking them “to formally open criminal investigations into the political stunt that brought two planeloads of immigrants to Martha’s Vineyard earlier this week,” per a statement on their website.

In the letter to U.S. Attorney Rachael Rollins, the group alleges there were “civil rights violations” with the way the migrants were transported.