A gunman opened fire Wednesday at the Borderline Bar & Grill in Thousand Oaks, California, killing 12 people.

The popular establishment hosts College Country Night on Wednesdays, and it was full of young people that evening.

An additional 23 people were injured and released after receiving treatment at local hospitals, according to the Ventura County Sheriffs Office .

They are just kids, an eyewitness who identified himself as Tim told ABC 7 , struggling to hold back sobs. Theyre all young. This shouldnt have happened to them.

According to records maintained by the Gun Violence Archive, this latest tragedy was the 307th mass shooting this year.

These are the victims:

Sheriffs Sgt. Ron Helus