SAN ANTONIO -- The South Texas Blood and Tissue Center is encouraging donors to give blood. The local blood center has less than a day of supply of Type 'O' Negative blood.

They're also seeking platelet donations for those in need at local hospitals. Following the shooting at a Sante Fe high school, the nonprofit realized a critical need for donors, worrying their center wouldn't have enough blood.. if it was needed in the south Texas town.

Anyone that is interested in becoming a donor, can visit the center’s website for information on how to donate.