Federal authorities secured an indictment on Thursday against a man accused of sending threatening letters to top US officials, including a ricin-related threat to President Donald Trump.
Here's a look at ricin, a natural, highly toxic compound that is extracted from castor beans.
A Utah man has admitted to sending letters that tested positive for ricin to President Donald Trump and top government officials, according to a probable cause statement obtained by CNN affiliate KTVX.
A subject believed to be connected to suspicious letters sent to President Donald Trump and top Pentagon officials was taken into custody by federal law enforcement in Utah, a federal law enforcement official told CNN on Wednesday.
An envelope addressed to President Donald Trump contained a substance suspected to be ricin and appeared to be connected to similar envelopes sent to the Pentagon, a law enforcement source told CNN.
