NEW YORK (WPIX) — What constitutes a mass shooting? Many experts consider any event where three or more people are killed by gunfire to be a mass shooting.
On Oct. 1 this year, when eight students and an assistant professor were fatally shot by a disturbed student at Umpqua Community College in Oregon, the Washington Post noted 274 days had passed in the year, up until that point — and already — there had been 294 mass shootings in the United States.
Deadliest mass shootings of 2015:
2015 deadliest worldwide mass shootings
2015 deadly mass shootings in the US and abroad
Pictures of Wednesday's shooting victims are displayed at a makeshift memorial site Monday, Dec. 7, 2015 in San Bernardino, Calif. Thousands of employees of San Bernardino County are preparing to return to work Monday, five days after a county restaurant inspector and his wife opened fire on a gathering of his co-workers, killing 14 people and wounding 21. (AP Photo/Jae C. Hong)
Police confer at an intersection near the scene of a shooting at a Planned Parenthood clinic Friday, Nov. 27, 2015, in Colorado Springs, Colo. A gunman opened fire at the clinic on Friday, authorities said, wounding multiple people. (AP Photo/David Zalubowski)
A woman is being evacuated from the Bataclan theater after a shooting in Paris, Friday Nov. 13, 2015. French President Francois Hollande declared a state of emergency and announced that he was closing the country's borders. (AP Photo/Thibault Camus)
Students, staff and faculty are evacuated from Umpqua Community College in Roseburg, Ore. after a deadlyshooting Thursday, Oct. 1, 2015. (Michael Sullivan /The News-Review via AP)
LAFAYETTE, LA - JULY 23: Lafayette police stand outside of the Grand Theater on July 23, 2015 in Lafayette, Louisiana. Three people are dead and seven more injured after a gunman opened fire inside the Grand Theatre. The gunman, whose identity is being withheld by police, is among the dead. (Photo by Stacy Revere/Getty Images)
Chattanooga police talk to Reserve Recruitment Center personnel at the Lee Hwy office as the area is cordoned off with blue shell casing markers in the parking lot on Thursday, July 16, 2015 in Chattanooga, Tenn. At least two military facilities in Tennessee were attacked in shootings Thursday, including one at a Navy recruiting building, officials said. (Tim Barber/Chattanooga Times Free Press via AP)
Worshippers gather to pray down the street from the Emanuel AME Church following a shooting Wednesday, June 17, 2015, in Charleston, S.C. (AP Photo/David Goldman)
Police forces gather in street outside the offices of the French satirical newspaper Charlie Hebdo in Paris on January 7, 2015, after armed gunmen stormed the offices leaving at least 10 people dead according to prosecutors. AFP PHOTO / MARTIN BUREAU (Photo credit should read MARTIN BUREAU/AFP/Getty Images)
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According to a Reddit community tracking mass shootings in the United States, the killings Wednesday constitute the 352nd mass shooting in 2015.
Just last week, the day after Thanksgiving, 57-year-old Robert Louis Dear killed a police officer and two civilians at the Planned Parenthood center in Colorado Springs, Colorado — during a six hour standoff.
He then turned himself in.
The Colorado shooting came exactly two weeks after synchronized terror attacks in Paris stunned the global community, leaving 130 dead at a concert hall, a soccer stadium, and two Parisian cafes. At least eight terrorists were believed to have executed the carefully-planned assaults, plotting their attacks from Brussels, Belgium.
Throughout the year, there were multiple mass shootings that left innocents dead in the United States — from Charleston, South Carolina to Chattanooga, Tennessee — where five U.S. military men were fatally shot at recruiting centers.