A B767-300 CREW; ENRTE TO BRAZIL; ENCOUNTERED SEVERE TURB; INJURING SEVERAL FLT ATTENDANTS AND 1 PAX.

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LEAVING MIA ARPT; WE ENCOUNTERED TURB CLBING OUT AT DIFFERENT ALTS FOR ABOUT 1/2 HR. SEVERAL SEATBELT PA'S WERE MADE AND THE FLT ATTENDANTS WORKING THE FLT TOOK THEIR JUMP SEATS AS IT WAS TOO DIFFICULT TO STAND/SERVE. THEN IT GOT SMOOTH; SO THE FLT ATTENDANTS AGAIN BEGAN THE SVC. AFTER ABOUT 10 MINS WE HIT A BIG BUMP AND SEEMED TO DROP QUITE A BIT. THE WORKING PURSER WAS THROWN TO THE FLOOR IN THE FIRST CLASS AISLE AND 2 OF MY DEADHEADING FLT ATTENDANTS WERE THROWN UP AND DOWN ON SEAT XYZ ARM REST. THE PURSER THEN ADVISED ME SEVERAL FLT ATTENDANTS HAD HIT THE CEILING IN FIRST CLASS AND A PAX HAD BEEN HURT GOING UP AND THEN DOWN ON THE ARM REST AT SEAT XYA. I WENT TO THE BACK AND FOUND ALL MY FLT ATTENDANTS INJURED AND 1 PAX INJURED AND DEBRIS EVERYWHERE AND CART TURNED OVER AT THE AFT GALLEY AREA. IN ALL; 11 FLT ATTENDANTS WERE TAKEN TO THE HOSPITAL IN SJU. I ASSISTED IN THE CLEAN UP; ALONG WITH OTHERS OF THE DEADHEADING CREW. WE TOOK OVER ALL INJURED FLT ATTENDANTS POSITIONING AND LANDED IN SJU FOR HELP.