People comfort each other as they stand near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif., where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding multiple people including a deputy who rushed to the scene. (AP Photo/Mark J. Terrill)
A young boy holds a sign at the intersection of Murray Ave. and Forbes Ave. in the Squirrel Hill section of Pittsburgh during a memorial vigil for the victims of the shooting at the Tree of Life Synagogue where a shooter opened fire, killing 11 and wounding six, including four police officers, Saturday, Oct. 27, 2018. (AP Photo/Gene J. Puskar)
Portrait of a group of relatives enjoying time together outdoors
Parkland, Florida, USA - April 25, 2018: The Marjory Stoneman Douglas High School in Parkland, Florida. The school was the site of a school shooting in 2018 which set off mass protests against gun violence.