A pair of mass shootings in less than 24 hours in the US states of Texas and Ohio killed 29 people over the weekend, authorities said.

Nine people in Dayton, Ohio, were killed and 16 others injured early on Sunday in the second mass shooting in the United States in less than 24 hours, police said. The identity of the suspected shooter, who also died, was not immediately released, police said.

The Ohio shooting came hours after a young man opened fire in a crowded shopping area in El Paso, Texas, leaving 20 dead and more than two dozen injured. Less than a week earlier, on July 28, a 19-year-old shot and killed three people, including two children, at the Gilroy Garlic Festival in Northern California.