Several Democratic presidential contenders called for action to end gun violence after a Saturday shooting at a Walmart in El Paso, Texas, that resulted in multiple fatalities.

A police source told local news station KTSM that 18 people were killed. The El Paso Police Department confirmed to the outlet that there were multiple fatalities but did not say how many. Police said one person was in custody after the incident.

Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE; Sens. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.), Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) and Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.); South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE; and former Housing and Urban Development Secretary Julián Castro expressed sadness while calling for change.

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The shooting took place in the hometown of former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas), who canceled some scheduled campaign stops to return to El Paso.

"How many lives must be cut short? How many communities must be torn apart?" wrote Biden. "It’s past time we take action and end our gun violence epidemic."

Heartbroken to hear the news from El Paso. Our thoughts are with those impacted by yet another senseless act of gun violence in America.



How many lives must be cut short? How many communities must be torn apart? It’s past time we take action and end our gun violence epidemic. — Joe Biden (@JoeBiden) August 3, 2019

"The news out of El Paso is devastating. I'm heartbroken for the victims and their families. Far too many communities have suffered through tragedies like this already. We must act now to end our country's gun violence epidemic," Warren wrote.

The news out of El Paso is devastating. I'm heartbroken for the victims and their families. Far too many communities have suffered through tragedies like this already. We must act now to end our country's gun violence epidemic. — Elizabeth Warren (@ewarren) August 3, 2019

Sanders specifically faulted the Republican-led Senate that he said "does nothing" after shootings.

Everyone in America, myself included, is devastated by the news of this latest attack in El Paso. Sadly, after each of these tragedies the Senate does nothing. That has got to change. — Bernie Sanders (@BernieSanders) August 3, 2019

Buttigieg noted a personal connection to the area where the shooting took place, saying his grandmother took him to the Cielo Vista Mall when he was younger.

"How many more must grieve before we act?" he tweeted.

My grandmother used to take me to Cielo Vista Mall. Now it’s one more mass shooting scene. How many more must grieve before we act? #ElPaso — Pete Buttigieg (@PeteButtigieg) August 3, 2019

Booker tweeted that the was praying for both "everyone affected by this unspeakable tragedy" and "for our country to find the moral courage to take action to end this carnage."

Enough. We need to end this national nightmare. Praying for everyone affected by this unspeakable tragedy, and for our country to find the moral courage to take action to end this carnage. https://t.co/vqTMSlbR8j — Cory Booker (@CoryBooker) August 3, 2019

O'Rourke, who represented El Paso in Congress, delivered emotional remarks after he received news of the shooting.

"I'm incredibly sad, and it is very hard to think about this, but I'll tell you, El Paso is the strongest place in the world," he said. "I'm going back there right now to be with my family and to be with my hometown."

Truly heartbreaking. Stay safe, El Paso. Please follow all directions of emergency personnel as we continue to get more updates. https://t.co/BU0AH6Y8Rv — Beto O'Rourke (@BetoORourke) August 3, 2019

O'Rourke later tweeted praise for the people of his birthplace in a video.

"El Paso is one of the strongest places in the world—and if there were ever a moment to be strong, it's this one," he said.

El Paso is one of the strongest places in the world—and if there were ever a moment to be strong, it's this one. Strong for one another, for the families who have lost somebody, and for the first responders. Please go to https://t.co/ecw9y18OSP to support our community. pic.twitter.com/FFgLPbXNIY — Beto O'Rourke (@BetoORourke) August 3, 2019

Castro, who is also from Texas, directly called for gun reform and blasted what he called "our government’s failure to do its most basic duty: to protect American lives."

My heart is with the people of El Paso today as they cope with a devastating mass shooting—the scope of which we are still learning.



This attack is a tragic reminder of our government’s failure to do its most basic duty: to protect American lives. We need gun reform now. https://t.co/z0JTng4kVa — Julián Castro (@JulianCastro) August 3, 2019

President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE also tweeted about the incident, writing "God be with you all!"