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Twelve people were killed, and multiple people were injured after a mass shooting at a Southern California bar late Wednesday, USA Today reports.

About 40 miles west of Los Angeles, a gunman opened fire inside a country-western dance bar in Thousand Oaks, California. At least 11 victims were killed at the scene; a deputy later died from his injuries, Ventura County Sheriff Geoff Dean said. The gunman, later identified by police as Ian David Long, was found dead inside.

The bar was hosting an event for college students at the time.

"There is blood everywhere," Dean said Thursday morning.

This is the deadliest mass shooting in the United States since 17 students and teachers were killed at a Parkland, Florida, school in February.

Thousand Oaks is now the site of the 307th mass shooting in the U.S. this year.

And an even grimmer statistic was marked: The 307th mass shooting took place on the 311th day of the year – an average of a deadly incident almost every day so far this year.

In all, 328 people died in mass shootings incidents, and 1,251 injured, according to data from the Gun Violence Archive, a not-for-profit organization that provides online public access to information about gun-related violence. The numbers include incidents in which four or more people were shot or killed, not including the shooters, according to the archive.