A Florida man who admitted he produced and sold potentially deadly toxins and plotted to kill a woman in London has been sentenced to more than nine years in prison.

Jesse William Korff was sentenced Wednesday in federal court in New Jersey. He pleaded guilty last year to producing and smuggling the toxins ricin and abrin and to conspiring to kill a person in a foreign country.

The U.S. attorney's office says the 20-year-old resident of LaBelle used an underground Internet marketplace to sell the toxins to buyers in India and Europe.

They say one shipment went to a woman in London who said she wanted to kill her mother.

Korff was arrested in January 2014 after he set up a transaction with undercover agents at a Florida rest stop.