Students from the Parkland high school where a mass shooter killed 17 people last week, protested at the Florida state capitol, demanding a ban on weapons like the one that killed their classmate. Student activists from around the country joined in with "walkouts" of their own.
- Police in California said they may have thwarted a school shooting after a resource officer reported a "disgruntled student" who threatened a school shooting; a "collection of weapons" was allegedly found in his home.
- Port Authority police arrested 19-year-old delivery man Bruce Lee after he tried to bike through the Lincoln Tunnel.
- Jennifer Lawrence responded to critics of a dress she wore in London, telling them to "get a grip."
- Recep Erdogan says Turkey will work on developing unmanned tanks.
- Snapchat responds to a Change.org petition about its latest redesign.
- A self-taught astronomer became the first person to witness the surge of light at the birth of a supernova when he captured images of 2016gkg.