Barack Obama, Hillary Clinton, Joe Biden, Robert De Niro and CNN were among the recipients of suspicious packages in the last few days, thought by investigators to be pipe bombs.
Although the motive is currently unknown, each of the individuals and organisations targeted are known to be critics of Donald Trump.
US Vice President Mike Pence condemned the bomb threats in a tweet.
We condemn the attempted attacks against fmr Pres Obama, the Clintons, @CNN & others. These cowardly actions are despicable & have no place in this Country. Grateful for swift response of @SecretService, @FBI & local law enforcement. Those responsible will be brought to justice.
— Vice President Mike Pence (@VP) October 24, 2018
How seriously should they be taken, and who is likely to be responsible?
Cal Thomas says things like this are "not just limited to one party."
"I think the politics in America has descended below the mud. It's just evil and horrible and I certainly condemn it no matter where it's coming from."
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