The FBI is confirming packages addressed to former Vice President Joe Biden and actor Robert De Niro are similar in appearance to those used to send bombs to prominent Democrats.
A law enforcement official said two packages addressed to Biden were intercepted at Delaware mail facilities in New Castle and Wilmington.
Pipe bombs addressed to Hillary Clinton, former President Barack Obama, former CIA director John Brennan and former Attorney General Eric Holder have also been intercepted in recent days.
We check in on the latest, plus how will the FBI go about investigating the source of these packages?
With files from the Associated Press
KPCC reached out to the FBI and was told that the investigation is ongoing, and that anyone with information should contact 1-800-CALL-FBI.
Tom Thurman, professor at Eastern Kentucky University where he teaches fire, arson and explosion investigation; he is a former Army Bomb Disposal Technician and Supervisory Special Agent with the FBI, where he spent 20 years doing forensic examination of explosive devices