3 PAX SIMULTANEOUSLY HEADING FOR THE RESTROOM DURING TAXI RESULT IN SECURITY CONCERNS AND A TKOF WITH CABIN ATTENDANTS OUT OF THEIR ASSIGNED SEATS.

Narrative

AFTER PUSHBACK AND UPON ENG START-UP; 3 PAX SEATED SEPARATELY GOT UP OUT OF THEIR SEATS TO GO TO 3 SEPARATE BATHROOMS. THE AFT FLT ATTENDANTS WERE CONCERNED BY THIS UNUSUAL BEHAVIOR; DID A SAFETY SWEEP OF THE BATHROOMS INVOLVED; AND THE PLT AND I WERE NOTIFIED OF THEIR CONCERNS. THE CAPT SAID THAT 'THEY' WERE GOING TO 'RUN' THE NAMES OF THE PAX OF CONCERN PRIOR TO TKOF; BUT WOULD CONTINUE TO TAXI TO THE RWY WHILE AWAITING FEEDBACK. THE AFT FLT ATTENDANTS ASKED ME TO COME TO THE BACK AND 'CHK OUT' THE PAX OF CONCERN; AND I DID SO. UPON GETTING BACK TO THE ACFT AND OBTAINING THE SEAT NUMBERS FROM THE OTHER FLT ATTENDANTS; THE ACFT MADE A SHARP TURN AND STARTED ROLLING DOWN THE RWY. NO ANNOUNCEMENT WAS MADE TO 'PREPARE FOR TKOF' FROM THE COCKPIT PRIOR TO TKOF. I WAS ABLE TO QUICKLY SIT IN AN EMPTY PAX SEAT AT APPROX ROW 31 OF THE R AISLE. AS SOON AS IT WAS SAFE FOR ME TO BE UP; I RETURNED TO MY JUMPSEAT AND AFTER STERILE COCKPIT WAS COMPLETE; I INFORMED THE CAPT WHAT HAD OCCURRED AND HE APOLOGIZED FOR NOT INFORMING THE CABIN CREW TO PREPARE FOR TKOF PRIOR TO DOING SO.