CABIN ATTENDANT RPT; B767; LAX-JFK; PAX LANDED IN LAVATORY; REFUSED TO COME OUT AFTER PLANE HAD STOPPED. DETAINED BY FAA AND POLICE AND RELEASED.

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PAX LOCKED HIMSELF IN AFT LAVATORY DURING LNDG. HE REFUSED TO COME OUT. FLT ATTENDANT COULD NOT GAIN ACCESS; BECAUSE HE WAS HOLDING DOOR. THE PAX BEGAN TO CHANT 'KINGDOM; PWR; GLORY' AT TIME WE WERE AT FINAL; SO I NOTIFIED COCKPIT AFTER WE BRAKED AND IT WAS SAFE TO GET UP AND GIVE THEM INFO. NEW YORK CITY POLICE MET FLT. THE PAX CAME OUT AFTER WE HAD STOPPED AND TOLD A FLT ATTENDANT HE WAS SCARED. THE PAX WAS QUESTIONED BY POLICE. HE WAS A 19 YR OLD MALE. HIS PARENTS WERE NOTIFIED. AFTER ABOUT 45 MINS OF QUESTIONING; HE WAS RELEASED BY SOC [AIRLINE'S SECURITY OPS] AND FAA. PAX WAS RELEASED TO HIS OWN CUSTODY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THAT SHE WAS THE PURSER; SO SHE HADN'T SEEN THE BOY UNTIL AFTER THEY LANDED AND HE HAD COME OUT OF THE LAVATORY. THE BOY SEEMED TO BE EITHER RETARDED OR SLOW AND APPEARED TO BE A RUNAWAY; BECAUSE HE HAD NO LUGGAGE. THE POLICE AND THE FAA CONTACTED THE BOY'S UNCLE; AND AFTER TALKING TO HIM; THEY RELEASED HIM.