The terrible massacre in Las Vegas is drawing attention to the discriminatory ban on gay blood donations still in place in the United States.

Following Sunday night's shooting which took the lives of 59 so far, and injured 527 others, the Red Cross made an appeal for blood donations.

But gay men can only donate blood after waiting 12 months from their last sexual contact with another man.

And people are tweeting about it:

https://twitter.com/LanceBass/status/915005520557121536?ref_src=twsrc%5Etfw&ref_url=http%3A%2F%2Fwww.mirror.co.uk%2F3am%2Fcelebrity-news%2Flance-bass-gay-blood-vegas-11279429

https://twitter.com/DTPJustin/status/914876661828526081

rly wish i could donate my gay blood

— elijah daniel (@elijahdaniel) October 2, 2017

It infuriates me that gay & bisexual men can be turned away from donating blood in Las Vegas because of the @US_FDA's discriminatory policy.

— Shane Bitney Crone (@ShaneBitney) October 2, 2017

Also, it's 2017 and gay men still can't donate blood.

— Robbie Rozelle (@divarobbie) October 2, 2017

I know three young, healthy friends who happen to be in Vegas right and now would love to give blood but can't because they're gay men.

— Jean Bentley (@hijean) October 2, 2017

https://twitter.com/mpolikoff/status/914920193482199041

Is is really that serious that y'all deny gay people…HUMAN BEINGS from donating blood? Like wtf…

— HOOD VOGUE is tired of poverty (@keyon) October 2, 2017