Several journalists who work for The New York Times have been ordered by a US court to give evidence. They will testify under oath before a grand jury.
The court orders, called subpoenas, were delivered to the journalists' homes. This action comes after their reporting on concerns about President Donald Trump's new Air Force One plane.
The newspaper reported that federal agents were responsible for delivering the subpoenas.
The grand jury is investigating a possible crime. The reason for the investigation was not made public.
The specific details of the reporting that led to the subpoenas have not been fully disclosed.
This event raises questions about press freedom and the government's ability to access information from journalists.