WATCH: FBI investigating bomb found in liberal philanthropist's mailbox

WATCH: FBI investigating bomb found in liberal philanthropist's mailbox

Transcript for FBI investigating bomb found in liberal philanthropist’s mailbox

Meantime, the FBI on the scene north of New York City after a live bomb was left in the mailbox of a philanthropist who funds democratic causes and is a frequent target of criticism from the president. ABC’s erielle reshef on the scene tonight. Reporter: Tonight, the FBI investigating that bomb found in the New York mailbox of billionaire liberal philanthropist George Soros. A senior law enforcement official describing the device as no hoax, similar to a people bomb. A security guard finding a suspicious package late Monday, then taking it to a wooded area. The ATF then safely detonating it. As they hunt for a suspect, federal investigators are reviewing surveillance video to figure out who dropped that package. Soros, who donates to liberal causes, has been a target of conservatives. They’ll go to a person holding a seen, who gets paid by Soros or somebody, right? That’s what happened. Reporter: While authorities are still trying to pin down a motive, investigators say that mailbox bomb is alarming, amid a backdrop of increasingly hostile political rhetoric. Jas leak week, this TMZ video showing senator majority leader Mitch Mcconnell getting yelled at by angry diners. Why don’t you get out of here? Why don’t you leave the entire country alone? Leader Nancy Pelosi confronted by protesters at a campaign stop in south Florida. You don’t belong here, you Communist. Get the Out of here. Reporter: They shout expletives at her as she exists through a door. And David, Soros’ foundation is not directly addressing this incident, but is saying the hateful rhetoric dominating politics both in the U.S. And abroad is breeding extremism. David? Erielle reshef tonight.

This transcript has been automatically generated and may not be 100% accurate.

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