Police charged 18-year-olds Amuel Zhine and Jervey Shamell with arson.
They were recently seen on video buying lighters at a grocery store.
The first fire broke out November 1 when a bus was torched on Albany Avenue in East Flatbush.
Since then, four more parked buses were set on fire.
The latest happened Thursday when the suspects set fire to a bus in front of Saint Catherine of Genoa Catholic Academy on Avenue D.
No one was hurt in any of the fires.
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