WASHINGTON -- NBC News reports that the Trump Administration's Department of Homeland Security is planning a nationwide operation to target more than 8,400 undocumented immigrants later this month.

The news organization cites three law enforcement officials and an internal document that described the raid as "the largest operation of its kind in the history of ICE," the U.S. Immigration and Customs Enforcement.

The raids, dubbed "Operation Mega," are set to begin Sept. 17 and last for five days according to the document, which was circulated in August.

Operation Mega, NBC reports, is still in the planning stage and details of the operation may change, or even be canceled, as the agency shifts resources toward rescue operations in Florida ahead of Hurricane Irma.

NBC says the operation would not target juveniles, according to one of the officials. A spokeswoman for U.S. Immigration and Customs Enforcement, Jennifer Elzea, told NBC News the agency "is not able to speculate about potential future targeted enforcement actions."

Read the full story on NBCNews.com.