RELATED: These are the victims of the Pulse Nightclub shooting in Orlando
Obama has been briefed by his homeland security and counterterrorism adviser and has asked for regular updates as the FBI and other federal officials work with police in Orlando, Florida, on the case.
The White House says Obama has directed federal officials to provide "any necessary assistance to pursue the investigation and support the Orlando community.
Police say a gunman opened fire inside the crowded nightclub early Sunday, killing at least 50 people before dying in a gunfight with SWAT officers.
PHOTOS: Mass casualties in Orlando nightclub shooting
It was the worst mass shooting in American history. Authorities are investigating it as an act of terrorism.
Click here for full coverage on the deadly mass shooting in Orlando.
Pulse shooting: In hail of gunfire in which suspect was killed, OPD officer was hit. Kevlar helmet saved his life. pic.twitter.com/MAb0jGi7r4— Orlando Police (@OrlandoPolice) June 12, 2016
My prayers are with the victims? families & all those affected by the shooting in Orlando. We will devote every resource available to assist— Rick Scott (@FLGovScott) June 12, 2016