<sod >A shooting at a high school in Parkland, Florida, left at least 17 people dead, officials said Wednesday, and the suspect -- believed to be a former student -- was in custody.< eod>< sod > A shooting at a high school in Parkland, Florida, killed at least 17 people, stunning the town and much of the nation, as investigators raced to find a possible motive behind the bloodbath.< eod>