The first assault occurred on Saturday morning in the border city of El Paso in Texas, where a gunman killed 20 people at a Walmart store before surrendering to the police.
At least 29 people have been killed and dozens wounded in two mass shootings within just 13 hours of each other in the United States.
Texas Governor Greg Abbott said the gun assault appeared to be a hate crime, and police cited a “manifesto” they attributed to the suspect, a 21-year-old white man, as evidence that the bloodshed was racially motivated.
A four-page statement posted on 8chan, an online message board and believed to have been written by the suspect, called the Walmart attack “a response to the Hispanic invasion of Texas”.
The attack ranked as the eighth-deadliest mass shooting in modern US history, after a 1984 shooting in San Ysidro, California, in which 21 people died.
Across the country, a second gunman dressed in body armour opened fire in a central district of Dayton, Ohio, early on Sunday, killing nine people and wounding at least 27 others.
Police officers who were on routine patrol nearby arrived on the scene in less than a minute and shot the attacker dead, likely preventing a much higher casualty toll, police and the city’s mayor said.
The motive behind the shooting was not immediately clear, and investigators believe the individual had acted alone, said Assistant Police Chief Matt Carper. The authorities said they had identified the shooter but were not yet disclosing his name.
The attacks came less than a week after a 19-year-old gunman killed three people and injured 13 others at the popular Gilroy Garlic Festival in California before dying of a self-inflicted gunshot wound.
‘Toxic brew of white supremacy’
US President Donald Trump branded the El Paso shooting “an act of cowardice” in a Twitter post on Saturday. On Sunday he said state and local authorities were working together to investigate both attacks.
The El Paso shooting reverberated on the campaign trail for next year’s US presidential election, with several Democratic candidates repeating calls for tighter gun control measures and others drawing connections to a resurgence in white nationalism and xenophobic politics in the country.
Several candidates pointed a finger at Trump, a claim the White House dismissed.
A hallmark of Trump’s presidency has been his determination to curb illegal immigration. The Republican president has drawn criticism for comments disparaging Mexican immigrants and referring to the flood of migrants trying to enter through the US southern border as an “invasion”.
In recent weeks, critics accused Trump of racism after his attacks on members of Congress who are members of racial or ethnic minorities.
In Texas, police and FBI investigators searched for clues as to what motivated the suspect Jonathan Yturales/Anadolu
“Donald Trump is responsible for this. He is responsible because he is stoking fears and hatred and bigotry,” US Senator Cory Booker, a 2020 Democratic presidential candidate, said on CNN’s “State of the Union”.
Beto O’Rourke, a former congressman from El Paso, said he believed Trump was a white nationalist whose anti-immigrant rhetoric stoked divisions.
“Let’s be very clear about what is causing this and who the president is,” O’Rourke said on CNN. “He is an open avowed racist and is encouraging more racism in this country.”
US Senator Bernie Sanders also took Trump to task. “We must come together as a nation to reject this dangerous and growing culture of bigotry espoused by Trump and his allies,” he said late on Saturday.
The White House cannot shirk its responsibility in shaping the public discourse, said Mayor Pete Buttigieg of South Bend, Indiana. “There’s no question that white nationalism is condoned at the highest levels of our government,” he told “Fox News Sunday.”
“He’s spoken about immigrants as being invaders. He’s given license for this toxic brew of white supremacy to fester more and more in this country, and we’re seeing the results of that,” presidential candidate Julian Castro, the former Democratic mayor of San Antonio, said on ABC’s “This Week.”
Mick Mulvaney, acting White House chief of staff, rebutted the Democrats’ allegations and attributed the shootings to “sick” individuals.
“There’s no benefit here in trying to make this a political issue, this is a social issue and we need to address it as that,” he said on ABC’s “This Week,”
Dayton is a riverfront city of about 140,000 people in southwestern Ohio Bryan Woolston/Reuters