Police say approximately 20 people have been killed inside a Florida nightclub, and at least 42 were wounded.
Orlando Police Chief John Mina says authorities have not determined an exact number of people killed, but that "approximately 20" have died.
An FBI spokesman says the mass shooting is being investigated as an act of terrorism. He says authorities are looking into whether this was an act of domestic or international terror, and if the shooter was a lone wolf.
Mina says the shooter was armed with an assault-type rifle, a handgun and some type of suspicious device. Police had said previously on Twitter that there was a "controlled explosion" at the scene of the shooting at Pulse Orlando. Mina says that noise was caused by a device intended to distract the shooter.
