People comfort each other as they sit near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
People comfort each other as they sit near the scene Thursday, Nov. 8, 2018, in Thousand Oaks, Calif. where a gunman opened fire Wednesday inside a country dance bar crowded with hundreds of people on "college night," wounding 11 people including a deputy who rushed to the scene. Ventura County sheriff's spokesman says gunman is dead inside the bar. (AP Photo/Mark J. Terrill)
In this image made from aerial video, police vehicles block an intersection in the vicinity of a shooting in Thousand Oaks, California, early Thursday, Nov. 8, 2018.  Authorities say there were multiple injuries _ including one officer _ after a man opened fire in Southern California bar late Wednesday. (KABC via AP)
In this image made from aerial video, police vehicles block an intersection in the vicinity of a shooting in Thousand Oaks, California, early Thursday, Nov. 8, 2018. Authorities say there were multiple injuries _ including one officer _ after a man opened fire in Southern California bar late Wednesday. (KABC via AP)
This image made from aerial video show officers around a Police SUV in the vicinity of a shooting in Thousand Oaks, California, early Thursday, Nov. 8, 2018. Authorities say there were multiple injuries - including one officer - after a man opened fire in Southern California bar late Wednesday. (KABC via AP)
This image made from aerial video show officers around a Police SUV in the vicinity of a shooting in Thousand Oaks, California, early Thursday, Nov. 8, 2018. Authorities say there were multiple injuries - including one officer - after a man opened fire in Southern California bar late Wednesday. (KABC via AP)
In this image made from aerial video, police vehicles line a road in the vicinity of a shooting in Thousand Oaks, California, early Thursday, Nov. 8, 2018. Authorities say there were multiple injuries _ including one officer _ after a man opened fire in Southern California bar late Wednesday. (KABC via AP)
In this image made from aerial video, police vehicles line a road in the vicinity of a shooting in Thousand Oaks, California, early Thursday, Nov. 8, 2018. Authorities say there were multiple injuries _ including one officer _ after a man opened fire in Southern California bar late Wednesday. (KABC via AP)
In this image made from aerial video, officials tend to a person on the ground in the vicinity of a shooting in Thousand Oaks, California, early Thursday, Nov. 8, 2018. Authorities say there were multiple injuries _ including one officer _ after a man opened fire in Southern California bar late Wednesday. (KABC via AP)
In this image made from aerial video, officials tend to a person on the ground in the vicinity of a shooting in Thousand Oaks, California, early Thursday, Nov. 8, 2018. Authorities say there were multiple injuries _ including one officer _ after a man opened fire in Southern California bar late Wednesday. (KABC via AP)

THOUSAND OAKS - A sheriff says 13 people are dead, including a sheriff's sergeant and the gunman, after a shooting inside a crowded Southern California bar late Wednesday.

Ventura County Sheriff Geoff Dean says sheriff's Sgt. Ron Helus responded to the scene and was shot after he entered the building. He died at a hospital early Thursday.

Authorities did not say how the gunman died.

Dean says around 10 other people were shot and wounded. No other information on the victims was immediately known.

Ventura County Sheriff's Office Capt. Garo Kuredjian said the first reports of shots fired came around 11:20pm at the Borderline Bar & Grill in Thousand Oaks, which is about 40 miles west of Los Angeles.

The bar's website says its hosts "College Country Night" every Wednesday. Police said hundreds were inside when the shooting occurred.

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Associated Press