MDT CREW FOUND THEY HAD CARRIED DANGEROUS GOODS WHICH WERE INCORRECTLY LOADED ON THEIR FLT BY COMPANY CARGO LOADERS.

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FLT PUSHED BACK OFF THE GATE IN PHL AT XA55 ON NOV/SAT/01 BOUND FOR ALLENTOWN; PA; AND BACK FOR A ROUND TRIP. IT WASN'T UNTIL WE RETURNED TO PHL; THROUGH CERTAIN EVENTS; WHEN WE HAD REALIZED WE HAD ACCIDENTALLY TRANSPORTED HAZMAT ON OUR FLT TO ALLENTOWN. THE HAZMAT WAS NOT NOTICED BECAUSE THE BAGGAGE HANDLERS IN PHL HAD MARKED 'NO' FOR HAZMAT ON OUR LOAD MANIFEST; AND ALSO PUT THE HAZMAT CARGO AS COMPANY MATERIAL INSTEAD OF THE PROPER COLUMN WHICH WOULD BE AIR FREIGHT. HOWEVER; THEY DID NOT PUT IN THE REMARKS SECTION THE WORD 'FLAMMABLE LIQUID.' WE AS A CREW DID NOT NOTICE THIS COMMENT BECAUSE IT WAS IN THE INCORRECT SECTION OF THE LOAD MANIFEST. ALSO; THE BAGGAGE HANDLERS ARE SUPPOSED TO TELL THE CAPT THAT THERE IS HAZMAT ON BOARD. I; AS THE FO; WAS NEVER INFORMED OF THIS INFO; NEITHER WERE ANY OF THE OTHER CREW MEMBERS WHEN THEY SHOULD HAVE BEEN. THIS EVENT TRANSPIRED BECAUSE OF THE LACK OF TRAINING FOR THE BAGGAGE HANDLERS ON JUST SIMPLY NOT PERFORMING THEIR JOB CORRECTLY. ALL OF THE BAGGAGE HANDLERS ARE TRAINED THAT THERE IS NO HAZMAT ALLOWED ON OUR ACFT. ALSO; IN OUR RESEARCH OF THE LOAD MANIFEST WE REALIZED THAT THEY ALSO LOADED 2 BAGS INCORRECTLY IN THE AFT CARGO COMPARTMENT. THIS SIT COULD HAVE BEEN AVOIDED IF THE BAGGAGE HANDLERS ARE TRAINED AND SUPERVISED MORE FREQUENTLY.