B777 FLIGHT CREW ENCOUNTERS UNREPORTED TURBULENCE AT FL390 CAUSING INJURIES TO PASSENGERS AND FLIGHT ATTENDANTS. FLIGHT CONTINUES TO DESTINATION.

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THIS INCIDENT OCCURRED AT NIGHT IN IFR CONDITIONS AT FL390. THE ACFT ENCOUNTERED TURB THAT LASTED APPROX 10-15 SECONDS. PRIOR TO ENCOUNTERING THE TURB; THERE WAS NO INDICATION OF ANY WX DISPLAYED ON THE WX RADAR. THE RADAR WAS TILTED DOWN 2 DEGS AND WAS ON A 160 NM SCALE. THE COCKPIT LIGHTS WERE TURNED DOWN AND VISUAL CHKS OUTSIDE WERE ACCOMPLISHED PERIODICALLY. HOWEVER; THE CONDITIONS WERE NOT CONDUCIVE TO OBSERVING WX VISUALLY. IT WAS VERY DARK WITH LITTLE TO NO MOON TO ILLUMINATE ANY CONVECTIVE WX. IT WAS MY IMPRESSION THAT WE HAD OVERFLOWN A BUILDUP. INITIAL REACTION FROM THE ACFT WAS A PITCH UP WITH A SLIGHT ALT GAIN OF 100-200 FT. THE ACFT SETTLED DOWN AFTER THE ENCOUNTER WITH NO FURTHER INCIDENT. THE CAPT CALLED THE CABIN CREW AND DETERMINED THERE WERE SEVERAL INJURIES TO FLT ATTENDANTS AND SOME PAX. THE CAPT CONTINUED COORD AND WITH THE FLT ATTENDANTS WHILE CONTACTING DISPATCH AND STATION OPS TO HAVE MEDICAL PERSONNEL MEET THE ACFT. THE ACFT WAS RECOVERED NORMALLY INTO ZZZZ. AFTER LNDG; THE INJURED FLT ATTENDANTS AND PAX WERE TAKEN TO A CLINIC AT THE ARPT. SINCE NO X-RAY FACILITIES WERE AVAILABLE; THE FLT ATTENDANTS WERE TAKEN TO A LOCAL HOSPITAL FOR FURTHER EVALUATION.