Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) on Sunday slammed Republicans for offering their condolences in the wake of the Texas church shooting while failing to take concrete steps to curb gun violence.

"Thoughts & prayers are not enough, GOP. We must end this violence. We must stop these tragedies. People are dying while you wait," Warren wrote in one tweet.

Thoughts & prayers are not enough, GOP. We must end this violence. We must stop these tragedies. People are dying while you wait. — Elizabeth Warren (@SenWarren) November 5, 2017

Warren took to Twitter to express her anger and heartbreak after a gunman opened fire at a church in Sutherland Springs, Texas, killing at least 26 people and injuring about 20 others.

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She took aim at the National Rifle Association (NRA), asking when her congressional colleagues will finally take a stand against their gun policies.

How many more people must die at churches or concerts or schools before we stop letting the @NRA control this country's gun policies? — Elizabeth Warren (@SenWarren) November 5, 2017

"How many kids must die of gun violence on playgrounds & streets every day with no attention at all before we wake up to what’s happening?" she wrote in a another tweet.

Texas Gov. Greg Abbott (R) called the church massacre the state's "deadliest mass shooting."

Authorities have not yet announced the identity of the shooter, who also died.

The Massachusetts lawmaker joins a growing group of Democratic lawmakers who are renewing their calls for gun reform in the wake of the latest mass shooting including Sens. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (Conn.) and Kamala Harris Kamala HarrisThe Hill's Campaign Report: Trump and Biden vie for Minnesota | Early voting begins in four states | Blue state GOP governors back Susan Collins Kamala Harris: Black Americans have been 'disproportionately harmed' by Trump Biden town hall draws 3.3 million viewers for CNN MORE (Calif.).