Ian David Long has been identified as the suspect in the mass shooting at a California nightclub, ABC News reports, citing law enforcement officials briefed on the probe. Neighbors told ABC News that he went by his middle name.

The shooting happened late Wednesday inside Borderline Bar & Grill in Thousand Oaks. At least a dozen people were killed, including a sheriff’s sergeant, Ron Helus. None of the other victims have been identified.

President Donald Trump wrote on Twitter, “God bless all of the victims and the families of the victims.”

Earlier Thursday morning, authorities said the gunman was found dead inside the nightclub. The motive is not clear and is under investigation, the law enforcement sources said.

Long, using a short-barreled handgun, wore a black trench coat and eyeglasses and had a black beard, witnesses said.

The shooter, who was a veteran of the U.S. Marines, was found dead at the scene, officials said. It’s not yet clear whether he shot himself or was killed by police.

The suspect was a white man in his late twenties, according to ABC News. The Associated Press reported that he was 29.

Investigators were knocking on doors of surrounding residents to find out what they may know about Long.

One neighbor who knew Long said he was a veteran who suffered from PTSD. She said, “I don’t know what he was doing with a gun.” Others said Long lived at the home with his mother.

His gun, which appears to be a .45-caliber handgun, was purchased legally, according to ABC News. AP reports that he also deployed a smoke device.

Source: AP & ABC News

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