The U.S. Justice Department on Wednesday opened an investigation into the operation of New York City hotels as migrant shelters, according to media reports.

Prosecutors asked for a list of names of “aliens” living at a Manhattan hotel. The city houses about 43,000 migrants in shelters, including dozens of converted hotels.

Federal prosecutors in Manhattan have reportedly issued a criminal subpoena to a hotel in Manhattan seeking a full list of names of migrants residing at it and potentially New York government