ACR X DSCNT TO OCCUPIED ALT TCASII TA RA DSND HAD NMAC LTSS FROM ACR Y. EVASIVE ACTION TAKEN. SYS ERROR.

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ACR X WAS ON APCH TO FT LAUDERDALE AND WAS BEING VECTORED OFF THE HONOE ONE ARR BY MIAMI APCH CTL. ATC ISSUED A VECTOR OFF THE ARR TO A HDG OF 090; LEVEL AT 8000 FT. DUE TO THUNDERSHOWER ACTIVITY IN THE AREA WE WERE UNABLE TO ACCEPT THE HDG OF 090 AND REQUESTED A VECTOR TO THE W. ATC GAVE US A TFC RPT OF AN LTT AT 11 O'CLOCK; 7000 FT AND ISSUED A CLRNC FOR US TO MAINTAIN VISUAL SEPARATION AND DSND TO 7000 FT. I ADVISED ATC WE WOULD BE UNABLE TO MAINTAIN VISUAL CONTACT WITH THE LTT AND RECEIVED A CLRNC TO DSND TO 7000 FT; TURN R TO HDG 300. WHILE IN THE DSCNT TCASII ISSUED A TA; THEN A RA ON THE LTT; SHOWING HIM TO BE AT 3 O'CLOCK COALT 7000 FT AND LESS THAN ONE MI CONVERGING. I QUESTIONED APCH ABOUT THE LTT'S ALT AND WAS TOLD THAT THEY WERE AT 6000 FT. I RESPONDED TO ATC THAT WE HAD A VISUAL AND WOULD DSND BELOW THE LTT PER TCASII 'RA'; (LTT WAS AT 7000 FT). MIAMI APCH CTL THEN GAVE US A CLRNC TO DSND TO 5000 FT AND TO ISSUE TA'S WITH INCREASING INTENSITY. (OUT ATTN WAS ON THE LTT). THE TCASII THEN ISSUED A VERY INTENSE RA; 'DSND; DSND NOW'; (WE WERE LEVEL AT 5000 HDG 270). THE TCASII VSI INDICATED A MAX RATE DSCNT WITH A TARGET (RED) ON THE RADAR AT 12 O'CLOCK LESS THAN 1/2 MI. SIMULTANEOUSLY WE RESPONDED TO THE TCASII RA AND MADE VISUAL CONTACT WITH THE LNDG LIGHTS OF A WDB (ACR Y) AT 12 O'CLOCK LESS THAN A QUARTER OF A MI AN AGGRESSIVE PUSH OVER WAS MADE BY THE FO ON COMMAND AND ACR Y PASSED MAYBE 50 FT ABOVE AND 100 FT TO OUR L WITH MINIMAL SEPARATION. I RPTED THE NEAR MISS TO MIAMI APCH CTL BY STATING 'YOU TURNED US RIGHT INTO ACR Y.' ACR Y FLT RESPONDED WITH 'YES; WE GOT A GOOD LOOK AT YOU ACR X.' THE APCH CTL SUPVR IMMEDIATELY TOOK OVER FOR ATC WITH A DSCNT CLRNC TO 4000 FT. A NORMAL APCH AND LNDG AT FT LAUDERDALE FOLLOWED.