The Broward County school shooting has led to a shortage of O negative blood, says an organization that provides blood to hospitals.

OneBlood says that after the shooting at Marjory Stoneman Douglas High School in Parkland, it rushed additional blood to Broward Health North Hospital and Broward Health Medical Center.

Immediate blood needs have been met, but there is a need to replenish the area's O negative blood supply.

O negative is the universal blood type and is used to treat trauma patients.

OneBlood is asking O negative donors to please visit a donor center or Big Red Bus blood drive and donate.

Appointments are encouraged and can be made online by visiting oneblood.org.