AN MD80 CREW HAD A BOMB THREAT AT THE GATE AT ORD. A JURISDICTIONAL DISPUTE ENSUED BTWN THE CHICAGO POLICE AND THE ACR. ACFT EVACED AT GATE. RAMP OP.

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APPROX 20 MINS PRIOR TO DEP; A UNIFORMED MAN LEANED INTO THE COCKPIT AND ASKED ME TO COME OUT ON THE JETBRIDGE; IT WAS AN EMER. ON THE JETBRIDGE WERE 2 UNIFORMED CHICAGO POLICE OFFICERS AND THE ORD MGR ON DUTY OF PAX SVC. THE POLICE OFFICER IN CHARGE INFORMED ME THAT A POSITIVE BOMB THREAT ON OUR FLT WAS RECEIVED BY THE POLICE VIA TWO 911 CALLS. I MADE A PA TO THE PAX ASKING THEM TO EXIT THE ACFT AND TO LEAVE THEIR PERSONAL BELONGINGS ON BOARD; PER OUR OP MANUAL. WHILE THE PAX WERE EVACING; THE POLICE OFFICER REQUESTED THAT I ASK THOSE REMAINING TO TAKE THEIR PERSONAL BELONGINGS WITH THEM AS THEY EXITED. ONCE ALL PAX WERE CLR OF THE ACFT; THE SIT DETERIORATED INTO A DISAPPOINTING DISPLAY OF TEMPERS; CONFUSION AND AN INABILITY TO DETERMINE WHO HAD AUTH OVER THE ACFT. THE CHICAGO POLICE WERE DEMANDING CTL SINCE THEY RECEIVED THE 2 THREATS VIA 911. THEY WANTED THE ACFT PUSHED FROM THE GATE TO THE SAFE AREA FOR INSPECTION. THE MGR ON DUTY RESISTED RELINQUISHING CTL OF THE ACFT TO THE POLICE. WHILE THEY WERE DEBATING ON THE JETBRIDGE; I CALLED DISPATCH AND SYS OPS CTR. THEY WERE NOT EVEN AWARE OF THE SIT TAKING PLACE. EVENTUALLY THE POLICE HAD THE ACFT PUSHED OUT FOR INSPECTION. DURING MY CONVERSATION WITH SOC; I WAS INFORMED THAT ACR DID NOT EVEN CONSIDER THIS A POSITIVE THREAT AND WOULD NOT HAVE INFORMED ME. HOWEVER; I WAS NOT AWARE OF THE THREAT; AND I STAND BEHIND MY ACTIONS AND THOSE OF THE CHICAGO POLICE.