Story highlights Concerned family members can call (407) 246-4357Orlando-area residents can help by giving bloodThere's a special call right now for O Negative blood in Orlando area(CNN) There's one way you can help victims of the Orlando, Florida, terror attack, the deadliest mass shooting in U.S. history. Officials in Orlando are asking for for blood donations, especially from people who have rare O Negative blood. Orlando Mayor Buddy Dyer said Sunday that relatives of victims who need information can call a special hotline at (407) 246-4357. Officials are urging Orlando-area residents to go to their local blood banks and not to hospitals at this time. "There is a dramatic increase in the demand for O Negative blood by area hospitals and as a result OneBlood , the local blood center, is urging people with O Negative blood to please donate as soon as possible," OneBlood said in a release.

Source: CNN June 12, 2016 16:07 UTC