More than 50 people were killed Sunday night in Las Vegas, in what is now the deadliest mass shooting in modern American history. After a gunman opened fire at a music festival, 406 people were transported to local hospitals. And starting in the wee hours of Monday morning, the people of Las Vegas were lining up in droves to help them.

Local reporters and residents posted on social media that as of early Monday, there were lines around the block across the city to give blood. After the shooting, Las Vegas authorities called for people to donate, and the city instantly responded. As early as 3 a.m., parking lots were full at donation centers, with hundreds of donors showing up to do what they could to help.

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This is the scene at one of the local blood banks (United Blood on W Charleston). Vegas is an amazing community. Our city is coming together pic.twitter.com/Xk7zTZWOR6 — Dave Farra (@DaveFarra) October 2, 2017

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Cannot believe what happened in my city. #prayforvegas #route91harvest Now waiting in line with lots of others to donate blood. pic.twitter.com/0NwAkI8DRc — Kirk Zylstra (@kirkdz) October 2, 2017

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This is Vegas!!!! Line wrapped around United Blood Services, waiting to donate blood this morning #vegasstrong pic.twitter.com/3061LtwaiY — Kathleen Sweeney (@3morethanfiddy) October 2, 2017

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LOOK: parking lot of blood donation center on Charleston is full. At 3:48am. #Vegas is strong and compasionate. @BethFisherTV @ktnv pic.twitter.com/ltcQ3P6a9K — David Schuman (@david_schuman) October 2, 2017

If you live in the area and would like to donate blood, KVVU-TV reports that police are advising to stay away from hospitals since they are overloaded with victims, and instead go to the Labor Health & Welfare Clinic on 7135 W. Sahara Avenue and at the United Blood Center at 6930 West Charleston Boulevard and at 601 Whitney Ranch Drive in Henderson.

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If you would like to donate blood for the injured victims of the Strip shooting visit the Labor Health & Welfare Clinic, 7135 W. Sahara. — LVMPD (@LVMPD) October 2, 2017

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