One of the worst mass shootings in US history claimed 49 lives at Pulse, a gay nightclub in Orlando, Florida, on June 12, 2016.

The shooting occurred on the venue's Latin Night, and many of those killed were Latino.

The gunman was killed by police after a three-hour standoff, while people trapped inside desperately called and messaged friends and family.

It was the deadliest mass shooting in the United States until one year later, when 58 people were murdered at a Las Vegas country music concert.

Investigators work the scene at Pulse in the morning after the shooting.
Investigators work the scene at Pulse in the morning after the shooting.
Carlo Allegri/Reuters
Orlando police officers direct friends and family away from the scene.
Orlando police officers direct friends and family away from the scene.
Phelan M. Ebenhack/AP
In this photo released by the City of Orlando, the inside of Pulse is seen after the shooting.
In this photo released by the City of Orlando, the inside of Pulse is seen after the shooting.
City of Orlando
Orlando resident Jaqueline Perez sheds tears during a vigil at the Joy Metropolitan Community Church.
Orlando resident Jaqueline Perez sheds tears during a vigil at the Joy Metropolitan Community Church.
Zack Wittman/Tampa Bay Times/AP
Victims' bodies arrive at the Orlando Medical Examiner's Office.
Victims' bodies arrive at the Orlando Medical Examiner's Office.
Alan Diaz/AP
Flowers and police tape are seen near the Pulse nightclub.
Flowers and police tape are seen near the Pulse nightclub.
Sam Hodgson/The New York Times/Redux
Friends and family members embrace outside the Orlando Police headquarters.
Friends and family members embrace outside the Orlando Police headquarters.
Steve Nesius/Reuters
Marselle Ball attends a vigil at Jones High School in Orlando.
Marselle Ball attends a vigil at Jones High School in Orlando.
Jacob Langston/Orlando Sentinel/TNS/Zuma
President Barack Obama pauses as he speaks about the massacre at the White House later that day.
President Barack Obama pauses as he speaks about the massacre at the White House later that day.
Pablo Martinez Monsivais/AP
The day after the shooting, runners pass under flags flying at half-staff around the Washington Monument.
The day after the shooting, runners pass under flags flying at half-staff around the Washington Monument.
J. David Ake/AP
Tatiana Osorio cries while giving blood at a donation center in Orlando. She lost three friends in the shooting.
Tatiana Osorio cries while giving blood at a donation center in Orlando. She lost three friends in the shooting.
David Goldman/AP
Thousands gather for a vigil outside the Dr. Phillips Performing Arts Center in Orlando.
Thousands gather for a vigil outside the Dr. Phillips Performing Arts Center in Orlando.
Chris Urso/Tampa Bay Times/AP
Mourners join hands while standing outside the visitation for Pulse victim Javier Jorge-Reyes on June 15, 2016.
Mourners join hands while standing outside the visitation for Pulse victim Javier Jorge-Reyes on June 15, 2016.
David Goldman/AP
A couple embraces outside Parliament House.
A couple embraces outside Parliament House.
David Goldman/AP
The casket of Pulse victim Christopher Andrew Leinonen enters the Cathedral Church of St. Luke for his funeral service on June 18, 2016.
The casket of Pulse victim Christopher Andrew Leinonen enters the Cathedral Church of St. Luke for his funeral service on June 18, 2016.
David Goldman/AP