At least 10 people are dead and 27 injured after a mass shooting Sunday at a popular nightclub district in downtown Dayton, Ohio, according to police. It's the second mass shooting in 14 hours, after at least 20 people died and 26 were injured at a shopping area in El Paso, Texas. 

Dayton police confirmed that they killed the gunman, who began firing a .223 high-capacity rifle at about 1 a.m. The gunman was wearing body armor and had additional magazines with him. There were "multiple rounds" shot in the incident, according to authorities.

Police shot and killed the shooter "in less than a minute," Mayor Nan Whaley said at a press conference Sunday morning. The shooting happened outside in the Oregon District, an area popular with tourists for its nightlife and local businesses. Thousands were reportedly gathered in the area.

“As bad as this has been, it could have been much, much worse,” Assistant Police Chief Matt Carper said.

There is no known motivation for the shooter. He was identified as a white male and from the Dayton area. 

The shooting followed the El Paso shooting, which is being investigated as a possible hate crime. The alleged gunman, a 21-year-old white male, reportedly had an online manifesto that espoused white nationalist and anti-immigrant views.

A previous mass shooting took place July 28 at a garlic festival in Gilroy, California, with four killed and 12 injured.