ABE LCL CTLR EXPERIENCED OPERROR WHEN CLRING ACR FOR DEP ON RWY 6 WHEN LNDG SMA HAD NOT YET CLRED RWY; ACR INITIATED SELF ABORT.

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I WAS WORKING LCL CTL AT THE ABE ARPT. AN ACFT WAS IN THE PATTERN ON THE L DOWNWIND. ACFT X WAS ON THE R DOWNWIND; CLRED TO LAND ON RWY 6. ACFT Y WAS HOLDING SHORT OF RWY 6. ONCE ACFT X CROSSED THE THRESHOLD; ACFT Y WAS TIPH. I THEN ASKED ACFT X WHERE HE WAS PARKING; COORDINATED WITH GND CTL AND ISSUED INSTRUCTIONS TO CLR THE RWY AT A4 AND TAXI TO HANGAR ON LCL FREQ. ACFT X READ BACK THE INSTRUCTIONS AND APPEARED TO HAVE BEGAN A TURN AT A4. I THEN TURNED TO LOOK FOR AN ACFT ON THE L DOWNWIND TO ISSUE INSTRUCTIONS TO EXTEND DOWNWIND FOR DEPARTING JET TFC. I THEN TURNED AND SCANNED THE RWY; WHICH APPEARED CLR DUE TO THE RWY AND TXWY LIGHTS; AND CLRED ACFT Y FOR TKOF. AFTER ACFT Y BEGAN MOVING; I CLRED AN ACFT FOR THE OPTION. SOON AFTER; ACFT Y CALLED SAYING THAT HE HAD MISSED A4 AND ASKED IF HE COULD CLR AT B. I TOLD HIM TO TURN OFF IMMEDIATELY. ACFT Y ABORTED TKOF AND MOVED TO THE L SIDE OF THE RWY AVOIDING ACFT X OFF THE R WING. SUPPLEMENTAL INFO FROM ACN 804727: I WAS THE FO ON ACFT X WITH SVC FROM ABE TO ZZZ. AFTER COMPLETING A NORMAL NIGHT PREFLT AND BEFORE TKOF CHKLIST; WE WERE HOLDING SHORT OF RWY 6/A5 AT ABE. THE CTL TWR CLRED A CESSNA ACFT FOR LNDG AS WE HELD SHORT. AFTER A BRIEF DELAY THE CTL TWR NOTIFIED A SMALL GA ACFT ON L DOWNWIND TO 'EXTEND HIS DOWNWIND FOR DEPARTING REGIONAL JET TFC.' WE THEN RECEIVED TKOF CLRNC FROM TWR. THE TWR STATED; 'ACFT X; FLY RWY HDG; CLRED FOR TKOF RWY 6.' I READ BACK THE CLRNC AND WE COMPLETED THE BEFORE TKOF CHKLIST. THE CAPT TAXIED ONTO THE RWY AND ADVANCED THE THRUST LEVERS TO TKOF PWR AND STATED 'SET THRUST.' I; AS THE PNF; SET TKOF PWR. AFTER THE APPROPRIATE 80 KTS/CHKED CALLOUT; WE ACCELERATED FOR TKOF. I THEN HEARD A RADIO XMISSION ON TWR FREQ; 'TWR; I MISSED MY TURNOFF.' I GLANCED UP AND PICKED OUT A FAINT WHITE LIGHT TO THE R OF CTRLINE WHICH I IDENTED AS A SMALL ACFT. AT THAT TIME I STATED 'ABORT; ABORT' AND THE CAPT IMMEDIATELY REDUCED THE THRUST LEVERS; APPLIED FULL BRAKES; AND DEPLOYED THRUST REVERSERS. HE THEN MADE AN EVASIVE TURN TO THE L TO AVOID HITTING THE CESSNA. WE PASSED THE CESSNA AT ABOUT 40 KTS AND 10 FT OFF HIS L WING. WE BROUGHT THE AIRPLANE TO A STOP ON THE RWY AND THE CAPT NOTIFIED THE PAX TO REMAIN SEATED. WE THEN CONTACTED TWR AND EXITED THE RWY. GND WAS CONTACTED AND WE PROCEEDED TO THE GATE AND DEPLANED NORMALLY. 1) TO PREVENT THIS I BELIEVE THE TWR SHOULD HAVE VERIFIED THAT THE RWY WAS CLR PRIOR TO CLRING US FOR TKOF. 2) IT DID NOT APPEAR THAT THE CESSNA HAD ANY STROBE LIGHTS ON WHICH WOULD HAVE ALERTED US TO HIS POS ON THE RWY. 3) THE PLT OF THE CESSNA NEVER SPOKE UP AFTER WE HAD BEEN CLRED FOR TKOF. SUPPLEMENTAL INFO FROM ACN 805056: I WAS CLRED TO LAND ON RWY 6 AT ABE. AFTER LNDG; WAS TOLD TO EXIT AT A4 AND STAY WITH TWR FREQ. AT THAT POINT I WAS ALREADY PAST THE TURNOFF FOR A4. I CONTINUED DOWN THE RWY AND ASKED TO EXIT AT BRAVO. WAS TOLD BY THE TWR NO DELAY. AS I WAS TURNING TO THE R TO EXIT ON BRAVO; WE SAW A LARGE JET ACFT ON OUR L SWERVE TO AVOID US. WE THEN PROCEEDED TO THE INTXN OF RWY 13/31 ON TXWY A. WE WERE THEN CLRED TO TAXI TO HANGAR. AT NO TIME AFTER LNDG DID WE HEAR THE TWR CLR THE JET FOR TKOF; OR THE JET RESPOND CLRED FOR TKOF RWY 6. AT NO TIME DID TWR CTLR INDICATE TO US THAT THERE WAS A PROB EXCEPT FOR THE AFOREMENTIONED 'NO DELAY EXIT AT BRAVO.' WHILE TAXIING TO HANGAR; WE HEARD VOICES ON TWR FREQ SAYING 'HELLO; HELLO; IS ANYBODY THERE? HELLO I CAN'T HEAR YOU; PLEASE ANSWER. HELLO; HELLO I STILL CAN'T HEAR YOU; ARE YOU THERE?' THIS PATTERN OF PHRASES IS NOT USED BY PLTS. I AM NOT SURE IF THOSE VOICES STEPPED ON ANY XMISSIONS WHILE I WAS ON THE RWY. REGARDLESS OF THAT; THE JET SHOULD HAVE NOT BEEN CLRED FOR TKOF UNTIL ACFT Y TOLD THE TWR I WAS CLRING RWY 6 AT BRAVO.