U.S. authorities say they have found three more suspicious packages similar to those sent to former President Barack Obama, the Clintons, as well as CNN.
The FBI said Thursday that two packages containing potential explosive devices were sent to former Vice President Joe Biden.
The other was sent to a New York restaurant owned by the actor Robert De Niro.
That marks a total of 10 such packages being sent to prominent Democrats and critics of President Trump over the past few days.
Investigators are reportedly looking into a USPS facility in Florida, where some of the packages may have originated.
Shortly after Thursday's incident, Trump seemed to blame the media, tweeting that so-called "Fake News" is causing anger in American society.
The tweet came just a day after he called for unity.