Angel Mendez, standing outside the Orlando Regional Medical Center, holds up a cell phone photo trying to get information about his brother Jean C. Mendez. (AP)
Police officials investigate the lot behind the Pulse nightclub. (AP)
A group of people walk to the emergency room of Orlando Regional Medical Center a (AP)
Law enforcement officials work near a large broken window at the Pulse nightclub (AP)
Volunteers wait in line to donate blood at the OneBlood in Orlando, Fla. (AP)
Law enforcement officials stand on the street beside the Pulse nightclub (AP)
Police officials investigate the back of the Pulse nightclub (AP)
Judy Rettig, right, and Karen Castelloes cry during a prayer vigil Joy Metropolitan Community Church. (AP)
Terry DeCarlo, executive director of the LGBT Center of Central Florida, center, is comforted by Orlando City Commissioner Patty Sheehan. (AP Photo/Phelan M. Ebenhack)
President Barack Obama receives an update in the Oval Office from FBI Director James Comey and Homeland Security Advisor Lisa Monaco on the shooting in Orlando, June 12, 2016. (Official White House Photo by Pete Souza)
President Barack Obama speaks about the massacre at a Orlando nightclub during a news conference at the White House in Washington, Sunday, June 12, 2016. (AP Photo/Pablo Martinez Monsivais)
Florida Gov. Rick Scott, center, addresses reporters during a news conference after a shooting involving multiple fatalities at a nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Family members wait for word from police after arriving down the street from a shooting involving multiple fatalities at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, (AP Photo/Phelan M. Ebenhack)
Orlando Police officers direct family members away from a fatal shooting at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Jermaine Towns, left, and Brandon Shuford wait down the street from a multiple shooting at a nightclub in Orlando, Fla. Towns said his brother was in the club at the time. (AP Photo/Phelan M. Ebenhack)
Bystanders wait down the street from a multiple shooting at the Pulse nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Police officers stand guard down the street from the scene of a shooting involving multiple fatalities at a nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
An Orange County Sheriff's Department SWAT member arrives to the scene of a fatal shooting at Pulse Orlando nightclub in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Police cars surround the Pulse Orlando nightclub, the scene of a fatal shooting, in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack))
Police cars and emergency vehicles surround the Pulse Orlando nightclub, the scene of a fatal shooting, in Orlando, Fla., Sunday, June 12, 2016. (AP Photo/Phelan M. Ebenhack)
Emergency personnel wait with stretchers at the emergency entrance to Orlando Regional Medical Center hospital for the arrival of patients. (AP Photo/Phelan M. Ebenhack)
A police officer stands guard outside the Orlando Regional Medical Center hospital after a fatal shooting at a nearby Pulse Orlando nightclub in Orlando, Fla. (AP Photo/Phelan M. Ebenhack)
Photos from the scene of a mass shooting in Orlando, Florida that left at least 50 people dead at a nightclub in the early morning hours of Sunday, June 12, 2016.