Authorities say a former student opened fire at a Florida high school Wednesday, killing "numerous" people. The Broward County sheriff said 14 people were taken to hospitals. Here's a look at some recent U.S. school shootings, and some of the deadliest of years past:

— Jan. 23, 2018: Two students were killed and 14 wounded by gunfire when a student opened fire before classes began at Marshall County High School in west Kentucky, authorities said. A grand jury is meeting to consider charging the 15-year-old boy as an adult.

— Dec. 7, 2017: Two students at Aztec High School in New Mexico were ki...