Multiple explosive devices were sent to prominent Democratic figures, law-enforcement officials said Wednesday, including former President Barack Obama and former Secretary of State Hillary Clinton.
CNN's offices in New York City also received a package with an explosive device.
The explosives were reportedly similar to a bomb found in the mailbox of billionaire George Soros, founder of Opening Society Foundations, on Monday.
The White House strongly condemned the attempted acts of violence, and pledged to bring "those responsible for these despicable acts to justice."
Those targeted with the explosive devices have all been vocal critics of President Donald Trump.
Here's what we know about the multiple bomb threats: