Matt Wennerstrom said he immediately recognized the sound of gunfire. He smashed a window with a barstool to rescue people in the bar as the shooting was taking place.
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"We probably pushed 30 or 35 people through that window," Wennerstrom said.
PHOTOS: Mass shooting at nightclub in Thousand Oaks, California
Blood was visible on the sleeve of his shirt.
"All I did was grab as many people as I could and pull them underneath the table until I heard a break in the shots, and then we got people out of there, as much as we could," he said.
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One woman who went through the window was in tears describing the event.
Wennerstrom, who said he visits Borderline Bar & Grill every week, said all he wanted to do was get his friends to safety.
The shooting happened around 11:20 p.m. Wednesday at Borderline Bar & Grill. Authorities said hundreds of people were inside the bar when the gunfire rang out.
The shooting left 12 people dead, including a Ventura County sheriff's sergeant, authorities said.
Authorities said the suspect was killed inside the venue.
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