A gunman opened fire in a crowded nightclub in Orlando, Florida, early Sunday morning. At least 50 people are dead and 53 wounded.
It is the worst mass shooting in U.S. history. The previous deadliest mass shooting in the U.S. was the 2007 attack at Virginia Tech. A student there killed 32 people before killing himself.
Here's a look at some of the nation's deadliest shooting attacks since 2012: