Actor Robert De Niro and former American Vice President Joe Biden are the latest victims of a mail-bomb campaign.
No-one has been injured to date, but all the intended targets have previously criticised Donald Trump.
Yesterday, two suspected bombs were intercepted, one addressed to Barack Obama, the other to Hillary Clinton.
Staff had to vacate their offices at CNN yesterday - the channel that US President Donald Trump previously called "fake news."
Explosive devices were also sent to California congresswoman Maxine Waters and to former attorney general Eric Holder.
The package addressed to Mr. Holder was reportedly addressed incorrectly and re-directed to Florida congresswoman Debbie Wasserman Schultz, who had been named as the return address.
Sarah Huckabee Sanders, a White House spokeswoman, has reiterated Mr. Trump's claims the media are partly to blame for these bombs.