A look at some of the deadliest US school shootings

TEXAS: There have been dozens of shootings and other attacks in US schools and colleges over the years, but until the massacre at Colorado's Columbine High School in 1999, the number of dead tended to be in the single digits. Since then, the number of shootings that included schools and killed 10 or more people has mounted.

The most recent two were both in Texas. The most recent one was in Robb Elementary School in Uvalde in Texas, when an 18-year-old gunman opened fire, killing 19 children and two adults, officials said. The 18-year-old attacker was killed by law enforcement.

In May 2018, a 17-year-old opened fire at a Houston-area Santa Fe High School, killing 10 people, most of them students, authorities said. The suspect has been charged with murder. In February 2018, an attack at Marjory Stoneman Douglas High School left 14 students and three staff members dead. The school was located in Parkland, Florida. The incident injured many others too. The 20-year-old suspect was charged with murder.

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In October 2015, a man killed nine people at the Umpqua Community College in Roseburg, Oregon, and wounded nine others, then killed himself. In December 2012, a 19-year-old man killed his mother at their home in Newtown, Connecticut, then went to the nearby Sandy Hook Elementary School and killed 20 first-graders and six educators. He took his own life.

In April 2007, a 23-year-old student killed 32 people on the Virginia Tech campus in Blacksburg, Virginia, in April 2007; more than two dozen others were wounded. The gunman then killed himself. In March 2005, a 16-year-old student killed his grandfather and the man's companion at their Minnesota home, then went to nearby Red Lake High School, where he killed five students, a teacher and a security guard before shooting himself. In April 1999, two students killed 12 of their peers and one teacher at the Columbine High School in Littleton, Colorado, and injured many others before killing themselves.

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