At least a dozen people were killed after a gunman opened fire at a nightclub in Thousand Oaks, California.
Hundreds of people were inside the Borderline Bar & Grill when the gunfire rang out, authorities said. The suspect was found dead inside the nightclub.
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The suspect was identified as Ian David Long. Among those who were killed is a Ventura County sheriff's sergeant, Ron Helus.
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People stand in a parking lot along South Moorpark Road in the aftermath of a mass shooting at Borderline Bar & Grill, on Thursday, Nov. 8, 2018. (Kent Nishimura / Los Angeles Times)
Potential witnesses sit near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif., where a gunman opened fire Wednesday inside a crowded country music bar. (Mark J. Terrill/AP Photo)
Ventura County Sheriff Geoff Dean speaks to reporters near the scene in Thousand Oaks, Calif., on Thursday, Nov. 8, 2018. (Mark J. Terrill/AP Photo)
Ventura County Sheriff Geoff Dean speaks to reporters near the scene in Thousand Oaks, Calif., on Thursday, Nov. 8, 2018. (Mark J. Terrill/AP Photo)
(Ron Helus/Facebook)
A witness talks to reporters outside a country music bar and dance hall in Thousand Oaks after a gunman barged into a large, crowded venue and opened fire late November 07, 2018. (JAVIER TOVAR/AFP/Getty Images)
A forensics team gets ready work the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. (Mark J. Terrill/AP Photo)
An FBI agent works the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. (Mark J. Terrill/AP Photo)
A forensics team works the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. (Mark J. Terrill/AP Photo)
A forensics team works the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. (Mark J. Terrill/AP Photo)
A forensics team works the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. (Mark J. Terrill/AP Photo)
People comfort each other as they stand near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. (Mark J. Terrill/AP Photo)
People comfort each other after gunman opens fire on a nightclub in California. (AP Photo/Mark J. Terrill)
An FBI agent talks to a potential witness at a shooting at a California nightclub. (AP Photo/Mark J. Terrill)
Two young ladies comfort each other after a shooting at a California nightclub. (AP Photo/Mark J. Terrill)
People walk away from the scene after a gunman opens fire on a nightclub in California. (AP Photo/Mark J. Terrill)
People comfort each other after gunman opens fire on a nightclub in California, killing at least 11. (AP Photo/Mark J. Terrill)
Sheriff's deputy speaks to a potential witness outside of a California nightclub where a gunman opened fire, killing at least 11. (AP Photo/Mark J. Terrill)
People comfort each other outside California nightclub after gunman opens fire, killing at least 11. (AP Photo/Mark J. Terrill)
Sheriff's deputies speak to a potential witness after gunman opens fire inside a country dance bar, wounding 11 people including a deputy who rushed to the scene. (AP Photo/Mark J. Terrill)
Two men embrace after a mass shooting at California nightclub. (CNN)
Two men embrace after a mass shooting at California nightclub. (CNN)
Authorities rush to the scene after a gunman opens fire on a nightclub in California. (CNN)