( CNN ) -- A 13-year-old girl was fatally shot Tuesday morning on a private school bus while traveling with her 7-year-old sibling and seven other pupils in Florida , and another student has been arrested as the suspected shooter , authorities said . The younger sibling witnessed the shooting in Homestead , Florida , according to the Miami-Dade Police Department . The yellow school bus did n't have surveillance cameras , police said . The 13-year-old girl was airlifted to Miami Children 's Hospital , where she died , police said . A motive had n't been determined Tuesday , and police were investigating the relationship between the shooter and the victim , Officer Alvaro Zabaleta told reporters . `` It 's traumatic for them for what they had to witness to begin with , and now you 're going to have to question them to ask them exactly what they saw , '' Zabaleta told CNN affiliate WPLG . `` You know , it 's tragic . Anytime it deals with a child , and then , of course , when we get the phone call that they confirmed that she passed away , it 's very sad . '' The victim was being bused about 6:30 a.m. Tuesday to Palm Glades Preparatory Academy Charter School in Miami , said Javier Baez , spokesman for Miami-Dade Police . None of the other children on the bus was injured , and all parties present at the shooting were taken to the homicide bureau for questioning , police said . Police did n't have further information Tuesday on the firearm used in the shooting . More crime and justice news on CNN.com . Arrest made in zoo monkey 's death . NYPD : Same shooter might be behind three slayings . CNN 's Nick Valencia contributed to this report .
A Florida girl , 13 , is fatally shot on a school bus taking her to a charter school in Miami . Her 7-year-old sibling witnessed the shooting , police say . Another student has been arrested as the suspected shooter , police say . The bus was carrying seven other pupils .