No students were hit when gunfire struck a Genesis School bus about 3 p.m. Wednesday near 24th Street and Olive Avenue, police said.
The bus was carrying 27 children; one bullet smacked the bus near its roof line, police said.
Police took two people into custody, but a third person remained at large.
The shooting occurred near Attucks Elementary School at 24th Street and Prospect Avenue. The school, which still was in session, went on lockdown.
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The Genesis bus was not a target but was in a line of fire between parties shooting at each other, police said.