Thirteen people have died, including a police officer, at a country music bar in Thousand Oaks, California.
In response to the attack, President Trump has tweeted: “I have been fully briefed on the terrible shooting in California.
“Law Enforcement and First Responders, together with the FBI, are on scene. 13 people, at this time, have been reported dead.
“Likewise, the shooter is dead, along with the first police officer to enter the bar.
“Great bravery shown by police. California Highway Patrol was on scene within 3 minutes, with first officer to enter shot numerous times. That Sheriff’s Sergeant died in the hospital.
“God bless all of the victims and families of the victims.
“Thank you to Law Enforcement.”
The shooting began at 11:20pm on Wednesday November 8 about 40 miles north-west of Los Angeles.
Authorities have revealed the suspect was found dead inside the bar.
An unknown number of people were hurt during the attack at the Borderline Bar and Grill.
One witness, Dean, described the scene as horrific.
He said: “There is blood everywhere and the suspect is part of that”.
The bar was full of hundreds of university student at the time of the shooting and they were forced to hide under the tables during the attack.
One witness told local news he saw the gunman throw smoke bombs before opening fire and shooting and killing the security guard.
John Hodge told KRTK-TV: “I was at the front door and I was talking to my stepdad. I just started hearing these big pops.
“Pop, pop, pop. There was probably three or four, I hit the ground. I look up – the security guard is dead.
“Well, I don’t want to say he was dead, but he was shot. He was down. The gunman was throwing smoke grenades all over the place.”
The horrific incident has came less than two weeks after a gunman with an automatic rifle fatally shot 11 people during sabbath services at a Pittsburgh synagogue.