Why the Arizona elementary school shooting was a ‘school shooting’

There’s no way to predict how many times a shooting like this will happen in the United States, but the facts do suggest it’s unlikely to happen again anytime soon.

The deadliest school shooting in U.S. history took place in a classroom on April 22, 2017, and remains the deadliest school massacre in U,S.

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Here’s what you need to know about the shooting.

1 of 14 Full Screen Autoplay Close Skip Ad × Photos from the scene of the shooting at the elementary school in Mesa, Arizona View Photos Investigators say the shooter opened fire with an AR-15 assault rifle inside the building.

Caption Investigators say a man who opened fire at the Mesa, Ariz., elementary school using an AR, was shot to death by officers.

April 22: Investigators release the names of the shooter and the people who were wounded.

Police say the suspect opened fire after a standoff with officers.

The gunman, identified as 28-year-old Michael T. Koval, was killed by officers after a shootout.

Two other people were injured.

Authorities say the shooting was not a random act.

April 23: Koval’s mother, Kristin, says she was told her son was “on the autism spectrum.”

The shooting is being investigated as a hate crime.

April 24: The FBI releases a statement saying it is “aware of the tragic incident in Mesa involving a young man.”

The FBI said that the FBI assisted Mesa police with the investigation, which was “closed as of April 24.”

March 2: The National Rifle Association (NRA) says it has begun “a national dialogue” on gun violence, and urged people to “share their thoughts and prayers.”

March 11: An anti-Trump rally is held in Phoenix, Arizona, that was planned by a local gun rights group.

One of the speakers said that he was there to protest Trump’s policies and said he had a “duty” to be there.

March 15: The Arizona Capitol Police arrest three men at the Capitol after they were caught on camera wearing masks and carrying weapons.

April 5: The first gunman killed five people and injured 10 others at the Pulse nightclub in Orlando, Florida.

The shooter, Omar Mateen, pledged allegiance to ISIS before committing the massacre.

June 16: A gunman opens fire at an elementary school before shooting himself, killing himself and wounding three other people.