Federal health officials have been instructed to temporarily stop any “external communications” to the public, according to two officials with knowledge of the situation.

The agencies are charged with making decisions that touch the lives of every American and are the source of crucial information to health-care providers.

The Centers for Disease Control and Prevention is going dark, along with other federal agencies within the umbrella of the U.S. Department of Health and Human Services. This week, the returning Trump administration told these agencies to stop talking to the public—for how long, no one knows.

The Trump administration has put a freeze on many federal health agency communications with the public through at least the end of the month

The administration of U.S. President Donald Trump has instructed federal health agencies to pause all external communications, such as health advisories, weekly scientific reports, updates to websites and social media posts,