Coast Guard lieutenant's mass attack plan thwarted

Prosecutors say Lt. Christopher Paul Hasson is a "domestic terrorist" who wrote about biological attacks and had a hit list that included prominent Democrats and media figures.
1:52 | 02/21/19

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Transcript for Coast Guard lieutenant's mass attack plan thwarted
alarming headline breaking as we come on tonight. A U.S. Coast guard lieutenant is under arrest tonight. Investigators say he was planning a major attack on innocent civilians and that he had a hit list of prominent names. They say he had a stock pile of weapons and ammunition, and they're calling him tonight a domestic terrorist. Here's ABC's chief justice correspondent Pierre Thomas now. Reporter: This is the arsenal, including 1,000 bullets, handguns and sniper rifles that the FBI fears an officer in the U.S. Coast guard was plotting to use in a cold-blooded killing spree. Their stark warning -- 49-year-old lieutenant Christopher Paul Hasson "Intends to murder innocent civilians on a scale rarely seen in this country." Hasson arrested on gun and drug violations that the FBI calls "The proverbial tip of the iceberg." He is, they say, "A domestic terrorist" and a "White nationalist," who allegedly wrote he is "Dreaming of a way to kill almost every last person on the Earth." The FBI claims he was developing a possible hit list of prominent politicians and television personalities, including the speaker of the house Nancy Pelosi, senate minority leader Charles Schumer, senator Elizabeth Warren, senator kamala Harris and cable host Joe Scarborough. Hasson, who works at coast guard headquarters here in D.C., was also allegedly googling information about the "Most liberal senators" and asking ominous questions. Where senators live in D.C.? Are supreme court justices protected? This is very alarming. Pierre, you've been working your sources and yarning that the coast guard actually tipped the FBI off to this man? Reporter: That's right, David. This is a case of the coast guard becoming concerned about one of their own and tipping off the FBI, which launched a joint investigation. Hasson, who is also a former marine, has a court hearing tomorrow, David. Pierre Thomas with us tonight. Thank you, Pierre.

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

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