Dayton police tweeted that an active gunman situation began in the Oregon District at 1am local time, but that officers nearby were able to "put an end to it quickly". Those killed included Betts' sister.
In Ohio, more than 30 more people had injuries, including at least 14 who had gunshot wounds and others who suffered non-firearm injuries as people fled, city officials said. Nine people were killed; 27 were injured.
Bellbrook Police Chief Doug Doherty said he and his officers weren't aware of any history of violence by Betts, including during high school, and had no previous contact with him.
The incident was still in the early stages of investigation and it was too early to assign a motive, according to chief Biehl. "We have a lot of evidence still to go through".
"It's not what we're about", El Paso Mayor Dee Margo said. Sinclair Community College confirmed he attended there and studied psychology but wasn't enrolled this summer.
Daniel Cottrell, her former supervisor at the center, described Betts to The Washington Post as a "very positive person" who was well-liked by her peers. "Fast learner. Eager to overachieve".
The rifle was fitted with an extended drum magazine that could hold 100 rounds.
Police did not provide information about the Betts siblings' relationship, although they did say that the two arrived together but separated at some point.
Separately, police said investigators have so far found no evidence to indicate that a mass killing in the USA city of Dayton was motivated by racial hatred. REUTERS/Bryan Woolston NO RESALES.
Megan Betts, the sister of the suspect, was one of the nine people killed. Eleven remained hospitalized Monday, Fire Chief Jeffrey Payne said.
"Hate has no place in America", President Donald Trump said Monday morning in brief remarks at the White House. Police identified the shooter as 24-year-old Connor Betts.
In addition to Netanyahu's remarks, Israel's Foreign Ministry tweeted an image of "Tel Aviv's City Hall building lit up with the colors of the United States flag in solidarity with the mourning of the American people following the deadly shootings in #Ohio & #Texas".
Vermont Sen. Bernie Sanders on Saturday blasted Republican Senate leadership for being "more concerned about pleasing the NRA than listening to the vast majority of the American people" and said that President Trump has a responsibility to support common-sense gun safety legislation. The 20 mass killings in the U.S.in 2019 that preceded this weekend claimed 96 lives.
In Texas, where 22 were killed, authorities said the accused shooter drove almost 10 hours from his home in a Dallas suburb.
"There isn't much discrimination in the shooting", Assistant Police Chief Matt Carper told reporters. They said they also found a shotgun in his auto. Two of his colleagues were also shot and expected to make a full recovery.
Biehl said Betts' parents were having a tough time.
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