A mass shooting occurs at a bar in the Oregon Historic District of Dayton, Ohio, United States. Nine people are killed and at least 27 others are injured. The shooter Connor Betts is killed by police.
An employee is killed and four others injured in a mass shooting at a Walmart distribution center in Red Bluff, California, United States. The shooter was then confronted by responding police officers and fatally shot during a shootout.
The United Arab Emirates tells the UN Security Council that a "state actor" was most likely behind the May 12 attacks on four tankers off its coast, including ones from Saudi Arabia and Norway. UAE did not say who it suspected; the United States blamed Iran which denied the accusation.
In what is the deadliest mass shooting and the worst terror attack since 9-11 to occur in the United States, a mass shooting at a gay nightclub in the U.S. city of Orlando, Florida, kills at least 50 people, including the shooter, and injures 53.
Police are tipped off when a posting on 4chan reveals plans to commit a mass shooting at New River Community College in Christiansburg, Virginia, United States. Two women are injured and a suspect is apprehended.
A mass shooting takes place at a courthouse in New Castle County, Delaware, United States, where a gunman shot and killed two women and injures two police officers. He is later found dead at the scene.