Growing concern of copycat attacks on FBI after Ohio standoff l ABCNL.

Suspect in FBI standoff in Cincinnati may have been motivated by conspiracy theories related to Trump, 2020 elections and the Mar-a-Lago raid.

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NOAA Hurricane hunters give Ian update from front lines.

NOAA Hurricane hunters give Ian update from front lines.

Capt. Jason Mansour from the National Oceanic and Atmospheric Administration Commissioned Officer Corps talks with World News Tonight anchor David Muir from high above Hurricane Ian.

Florida braces for impact as Hurricane Ian inches closer to landfall.

Florida braces for impact as Hurricane Ian inches closer to landfall.

Hurricane Ian strengthened to a Category 3 storm and is heading closer to Florida, which has already seen mass evacuations.

DEA warns about fentanyl being sold to kids

DEA warns about fentanyl being sold to kids

Federal officials are sounding the alarm over the dangers of fentanyl pills .

NASA successfully strikes asteroid in test run

NASA successfully strikes asteroid in test run

NASA officials applauded their successful mission to test if they can divert the path of an asteroid.

Hurricane categories explained: How strong is each category?.

Hurricane categories explained: How strong is each category?.

The National Weather Service uses a scale that only measures a hurricane's sustained wind speeds using a 1 to 5 rating system.