Julie Scott, a spokesperson for United Blood Services, told ABC News that the wait is reportedly between five and six hours for people who are currently in line at any of the three donation sites in and around Las Vegas.
Donations are coming in across the country, Scott said, adding that their call center fielded 26,000 calls this morning. She said that's \"very high, by about 20,000\" more calls than normal.
She said that the victims of the shooting \"are likely going to require surgeries in the weeks and months to come\" and since blood donations have a 42-day shelf life because of the red blood cell count, United Blood Services is urging people to book appointments to donate blood in the coming days and weeks.
\"We could face a shortfall in the weeks and months to come so we are really asking folks to make an appointment so that we can ensure that we are being good stewards of the gift that these donors are giving,\" she said.
The shooting occurred on the Las Vegas strip near the Mandalay Bay Casino and the Route 91 Harvest Festival, which was taking place nearby.
The number of fatalities make the incident the deadliest mass shooting in modern U.S. history, and local hospitals are dealing with the influx of people who need to be treated.
![\"PHOTO:](\"http://a.abcnews.com/images/US/las-vegas-shooting-blood-line-ho-ps-171002_4x3t_384.jpg\")
KTNV
PHOTO: The line to donate blood outside United Blood Service in Las Vegas, Oct. 2, 2017.
Local news channels showing footage of lines at blood donation centers spanning city blocks.
Las Vegas police also provided a number for those concerned about their loved ones to call.
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