AT CRUISE ONBOARD B757; SEVERE TURB ENCOUNTERED CAUSING PAX AND CABIN ATTENDANT INJURIES IN THE AFT OF THE ACFT. FLC RETURNED TO MIA FOR MEDICAL ASSISTANCE.

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I BELIEVE AT THE TIME OF THE OCCURRENCE; A TSTM WAS ON THE HORIZON AND THE ACFT; I AM TOLD BY THE COCKPIT; WAS HEADED FOR THE TSTM. I BELIEVE OUR FLT PLAN SHOULD HAVE TRIED TO DIVERT US AROUND THIS STORM INSTEAD OF THROUGH THIS AREA. HOWEVER; I DO BELIEVE OUR CAPT HAD NO IDEA THAT THIS WOULD HAPPEN. IT JUST HIT US SO SUDDENLY. BUT ANOTHER CREW MEMBER WHO WAS A PAX ONBOARD STATED THAT WE WERE GOING THROUGH THE STORM AT THE TIME OF THE TURB. WE WERE ABOUT 30-40 MINS OUT OF MIAMI AND OUR ACFT BEGAN TO GET BUMPY. WE WERE DOING OUR BEVERAGE SVC AND WE HIT AN AIR POCKET THAT WAS PRETTY BAD BUT RIGHT AFTER THAT; WE HIT THE CLR AIR TURB AND OUR CART FLEW AS HIGH AS THE ACFT ARMRESTS. BOTH MYSELF AND THE OTHER FLT ATTENDANTS HIT OUR HEAD ON THE ACFT CEILING. THE CART CAME BACK DOWN TWISTED AND ON TOP OF THE ARMRESTS. WE HAD TO LIFT THE CART OFF OF THE ARMREST. PAX AS WELL AS FLT ATTENDANTS WERE INJURED AT THIS TIME. THERE WERE NO WARNING SIGNS IT ALL HAPPENED SO SUDDENLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT 3 CABIN ATTENDANTS AND 6 PAX WERE HURT IN THIS INCIDENT. THE RPTR IS STILL OUT OF WORK TREATING A NECK AND BACK INJURY AND KNOWS OF 2 OTHER CABIN ATTENDANTS THAT WERE ON THIS FLT THAT ARE BEING TREATED FOR NECK PROBS. RPTR WAS WORKING IN THE AFT OF THE ACFT AS WERE THE OTHER FLT ATTENDANTS WHO WERE INJURED. THE PAX THAT WERE INJURED WERE IN THE RESTROOM DESPITE THE WARNING OF THE CABIN ATTENDANTS TO REMAIN SEATED. THE 4 OTHER PAX THAT WERE INJURED DID NOT HAVE THEIR SEAT BELTS FASTENED. RPTR STATES THAT THERE WAS NO BRIEFING ON THE GND BY THE CAPT TO NOTIFY THE CABIN ATTENDANTS OR ENSUING BAD WX. ALSO INFLT; THERE WAS NO ANNOUNCEMENT BY THE FLC THAT THERE WAS WX AND TO REMAIN SEATED UNTIL IT WAS SAFE. HENCE THE CABIN ATTENDANTS WERE UP IN THE AISLES WITH THE CARTS. NORMAL PROC IS IF THE CABIN ATTENDANTS ARE TO DELAY SVC DUE TO WX THE PIC CALLS AND TELLS THE CABIN ATTENDANTS TO REMAIN SEATED AND MAKES AN ANNOUNCEMENT TO THE PAX THAT WX AT THAT TIME PROHIBITS SVCS AND THE CABIN ATTENDANTS ARE TO REMAIN SEATED UNTIL THE PIC RELEASES THE SEAT BELT SIGN. THIS DID NOT HAPPEN. SUPPLEMENTAL INFO FROM ACN 411268: WE HAD NO WARNING. NO ONE IN MY IMMEDIATE AREA WAS HURT. I BELIEVE IT'S BECAUSE IT'S THE FORWARD OF THE ACFT AND YOU DON'T FEEL THE TURB AS SEVERELY AS THE AFT. SUPPLEMENTAL INFO FROM ACN 411276: I WAS FLYING ACFT (B757) 100 NM N OF TAMPA DEVIATING ALONG LINE OF CELLS ALONG COAST. WE WERE CLRED TO DEVIATE AND THEN DIRECT CRESTVIEW. AS WE TURNED TOWARDS CLR AIR WE RECEIVED A COUPLE OF BUMPS OF CHOP. NOTHING WAS BEING PAINTED ON THE RADAR. CAPT TOOK ACFT AND SLOWED DOWN. THE CHOP LASTED FOR ABOUT 2-3 SECONDS. AFTER ASSESSING THE TAIL SECTION OF THE CABIN WE ELECTED TO RETURN TO MIA FOR MEDIAL ASSISTANCE TO PAX AND CREW. THE SEAT BELT SIGN WAS ON DURING THE CHOP INCIDENT. A SMOOTH OVERWT LNDG WAS MADE ON RWY 9R AT MIA.