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The crash was reported about 7:15 p.m.; it happened between Scottdale and the village of Alverton.
The firefighters are being treated at local hospitals with non-life-threatening injuries.
A car crashed into a building housing a plasma center in Pittsburgh on Saturday, killing three people and injuring two others, one critically.
One person was killed in a fire Friday morning in Pittsburgh.
LODD Anniversary: Battalion Chief, Firefighter Killed, 29 Firefighters Injured in Pennsylvania Church Fire
A backdraft occurred earlier in the incident that injured an additional six fire fighters.