"God bless the people of Dayton, Ohio", and, separately, ordered American flags to be flown at half-staff as "a mark of solemn respect" for the victims of the tragedies.
Gun Violence Archive defines a mass shooting as four or more people being shot or killed during an incident, not including the shooter. Before the wall project started, El Paso had been rated one of the three safest major US cities going back to 1997.
"This is unprecedented in El Paso", said Gomez, who added that numerous injured had life-threatening injuries.
While waiting to donate, 25-year-old Aguirre left to buy ice to keep water cold for those standing in line outside in the heat Saturday. Foreign Minister Marcelo Ebrard reported six Mexicans were among the injured, including a 10-year-old girl. President Donald Trump tweeted: "Reports are very bad, many killed".
Officials said the shooter was Connor Betts, a 24-year-old white man.
The authorities identified the gunman as Patrick Crusius, from a Dallas suburb.
"In less than one minute Dayton first responders neutralized the shooter", she said. "That's where I spend my weekend, me and my husband".
New Jersey Senator Cory Booker was among them, saying the U.S. seemed to be "accepting the idea that these [shootings] are going to be a regular occurrence".
A bus ticket from the global bridge in Juarez to the Cielo Vista mall in El Paso costs $10. "That's where we go, especially for back-to-school shopping for the kids now, shoes, clothes", she said. "It (was) disgusting but it would have been so much worse", he said. "We've had guns in this country for hundreds of years".
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Laura Brownfield of Las Cruces said she was on her way to El Paso to go shopping when she had to turn around and go home, then made a decision to head to the mall.
"Blood banks were turning people away because so many people came to donate". "It's sad, but it's to save a life". The Democrat said the shooting shatters "any illusion that we have that progress is inevitable" on tackling gun violence.
"I just wanted to help".
"My son called me frantic saying that something happened to my daughter, and that is how we found out", Coca said.
It is thought the city's fire department are also on scene after Dayton police tweeted: "Dayton Fire is working to set up a family assistance centre at the Dayton Convention Centre".
The shaded bus stop near the Paso del Norte bridge offers daily transport across the border to various sites in El Paso, including downtown, the airport, the bus station - and the Cielo Vista Mall.
"We want to reassure the public - Albuquerque residents and neighbors from throughout the state - who are taking advantage of the tax-free holiday to shop for back-to-school items", Mayor Tim Keller said in a statement. "We all evacuated quickly and safely".
"Today, the El Paso community was struck by a heinous and senseless act of violence", his statement said.
Meanwhile, the police chief said among the possibilities being investigated is whether it was a hate crime.
"APD is thinking about our neighbors and family in El Paso", Geier said.
He appeared to be referring to a text posted on 8chan, an online message board frequently used by the far right, which describes a "cultural and ethnic replacement brought on by an invasion", in reference to Hispanic people in the US.