At 1:22 a.m., eyewitnesses reported that a gunman opened fire at the entrance of Ned Peppers Bar in the Oregon Historic District of downtown Dayton, Ohio, after being denied entry. (Intriguingly, in light of the "22" twinning, the phone number is area code - 224-44888.)
According to the authorities, the gunman used a .223 caliber long gun with a high-capacity magazine, had additional magazines with him, and was wearing body armor during the attack.
Ten people were killed, including the perpetrator, and at least 26 others were injured. The gunman was killed by police following a brief standoff. The attack was the second mass shooting in the United States in 24 hours, after a mass shooting in El Paso, Texas, the previous day.