There's one major way to help the shooting victims if you're near Las Vegas right now

As morning dawns on Las Vegas in the aftermath of Sunday night's horrific mass shooting, which killed at least 50 people and injured more than 400, that's the biggest thing anyone in the area — or even outside the area — can do to help. It's the singular plea echoing across social media again and again in the hours after the incident.

SEE ALSO: A troll explains why he tweeted a fake 'missing dad' picture from the Las Vegas shooting

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Blood donation requests in Las Vegas
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Blood donation requests in Las Vegas
If you would like to donate blood for the injured victims of the Strip shooting visit the Labor Health & Welfare Clinic, 7135 W. Sahara.
Just made an appointment to donate blood. You can do the same here: https://t.co/B9lqnnyEzx Spaces filling fast
Come to 6930 W. Charleston Rd to donate blood to all of our Las Vegas family ❤️❤️ https://t.co/EdpLqUyeX3
As a nurse in one of the Las Vegas' ER's this evening there are 2 things you can help us with..donate blood if you are able tomorrow & pray.
The line to donate blood is out the door at United Blood Service. People have been here all night waiting for it to… https://t.co/9Sa7xAggs7
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Even if you don't live in the immediate vicinity of Las Vegas, a blood donation in the greater area will help. There are mechanisms for moving blood donations around, and Nevada residents are especially in a position to help. 

Just bear in mind that some of these facilities may be closed in the early hours of the day. They may also be very busy, given what just happened. Even if there's a line, they still need your help. Just be patient, or look for alternatives.

A few general rules to keep in mind when it comes to blood donations:

In Nevada, people as young as 17 to donate without parental consent; 16-year-olds can donate as well, but only with parental consent (find the form you'll need right here). Regardless of age, a donor must also weigh more than 110 pounds.

All blood donors are screened ahead of time. As long as you're in relatively good health and disease/infection-free, it's worth your time to try to donate. Worst case, you're turned away.

The Las Vegas Sun wrote a how-to for blood donations in Nevada a couple of years ago. Most of the information in there (if not all of it) still applies, so give it a read if you're local and you have any further questions.

You should also pay a visit to the United Blood Services website. The nonprofit operates in many U.S. states (find the Nevada portal right here). There are multiple United Blood Services facilities throughout the state. You can see the list of them, organized by a helpful Twitter user, below.

The Red Cross also collects blood donations, with pop-up blood drives happening around the country on a weekly basis. There's one scheduled for Monday, Oct. 2 at the SpringHill Suites Las Vegas Convention Center that will be running from 9 a.m. PT to 4 p.m. PT. You can find a blood drive near you via a ZIP code search on the Red Cross website.

More from the scene of the shooting

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The most devastating images from the Las Vegas concert shooting
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The most devastating images from the Las Vegas concert shooting
LAS VEGAS, NV - OCTOBER 01: A man lays on top of a woman as others flee the Route 91 Harvest country music festival grounds after a active shooter was reported on October 1, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving at least 2 people dead. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - OCTOBER 01: People run from the Route 91 Harvest country music festival after apparent gun fire was hear on October 1, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving at least 20 people dead and more than 100 injured. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - OCTOBER 02: A cowboy hat lays in the street after shots were fired near a country music festival on October 1, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving at least 20 people dead and more than 100 injured. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - OCTOBER 01: People run for cover at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - OCTOBER 01:  A person lies on the ground covered with blood at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - OCTOBER 01:  A person lies on the ground at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - OCTOBER 01: (People carry a peson at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - OCTOBER 01: People take cover at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo by David Becker/Getty Images)
LAS VEGAS, NV - OCTOBER 01: A man in a wheelchair is taken away from the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino. (Photo by David Becker/Getty Images)
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