FLC OF LGT ON APCH IS GIVEN A TURN OFF COURSE; RECEIVES TCASII TA; THEN RA AND IS VECTORED FOR A GAR. A SECOND ACFT LINED UP WITH SAME RWY INSTEAD OF THE PARALLEL AND CUT THEM OFF.

Narrative

ON APCH TO RWY 9R ORD APCH CTL GAVE US A TURN OFF COURSE BECAUSE A FOREIGN CARRIER HAD INTERCEPTED RWY 9R IN FRONT OF US; THINKING IT WAS RWY 9L. WE RECEIVED A 180 DEG HDG AND A CLB TO 4000 FT. THEN FURTHER CLRNC TO CLB TO 5000 FT. AFTER QUESTIONING THE CTLR; WE THEN CLBED TO 5000 FT. AT LEVELOFF THE CTLR ISSUED AN IMMEDIATE R TURN TO 140 DEGS; THEN AN RA ON THE TCASII TO GO DOWN. ACTUALLY THE TA OCCURRED FIRST FOLLOWED BY THE RA. THE PF FOLLOWED THE RA; THE PNF TOLD ATC. AT 4500 FT THE CTLR SAID 'CLB;' AS THERE WAS TFC BELOW US AT 4000 FT. WE THEN CLBED BACK TO 5000 FT; WERE VECTORED FOR RWY 9R AGAIN; AND LANDED NORMALLY. THERE WERE AT LEAST 3 DIFFERENT VOICES ON ATC GIVING US COMMANDS; AND THE TCASII YELLING AT US TO DSND. THE PRIORITY WAS GIVEN TO THE TCASII. SUPPLEMENTAL INFO FROM ACN 366429: AFTER LNDG THE CAPT CONTACTED APCH CTL BY PHONE AND WAS TOLD WE WERE BROKEN OFF THE RWY 9R APCH AS AN ACR ON RWY 9L LINED UP WITH RWY 9R BY MISTAKE; CUTTING IN FRONT OF US AND THAT A FULL INVESTIGATION WOULD FOLLOW REGARDING THE TFC CONFLICT.