MIAMI (Reuters) – A student was taken in custody after a Florida girl was fatally shot aboard a private school bus. The police have reasons to believe that the boy is responsible for the killing of the 13-year-old girl, but further investigations will be performed on the case.

The 13-year-old girl was accompanied by seven other students on the school bus that was taking them to several charter schools in Miami. Miami-Dade Police Detective Javier Baez told the press that someone opened fire against the children and the girl was fatally wounded. She was airlifted to the Children’s Hospital in Miami, but there was nothing that doctors could to do save her life. The girl’s demise was pronounced soon after her arrival at the hospital.

According to Baez, the only suspect that was related to the shooting is a male student, whose identity has not been yet disclosed. He further added that it is too early to make any official declarations. He only informed reporters that the police don’t know what the shooter’s motives were.

The school bus was traveling on a road in the Homestead area of southwest Miami-Dade County, when its course was interrupted by the unexpected attack of the shooter. Witnesses spoke with the police, but there are many issues that remain unsolved. Authorities will have to verify all the records of surveillance cameras in order to shed light on the case.

Nobody knows whether the 13-year-old girl and the male student knew each other. Officers are now trying to figure out whether they were studying at the same school or they knew each other from some other place.