(CNN) Waiting in line for between six to eight hours, Las Vegas residents and visitors are out in force donating blood for victims of the deadliest mass shooting in modern US history.

Resident Shanda Maloney said she had seen the news about what was happening Sunday night. Sirens were wailing in the distance as ambulances rushed to nearby University Medical Center, less than a mile from her house, she said.

"Hearing all the sirens around, you feel completely helpless," she said. "I just started tweeting if you need a ride (I'll come pick you up)."

This. Is. Vegas.

This is our community.

These are our people.

Thank you to everyone here donating.#PrayForVegas #VegasShooting pic.twitter.com/wn5RA5jVLX — Shanda (@shanda) October 2, 2017

Then Maloney hit the road. "I just started picking people up and giving people rides," she said. Whether it was to a gas station or home, Maloney said she made sure they got there.

She wasn't the only one.

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