What was found
DURING TAKEOFF ROLL, BETWEEN 60-70 KNOTS, WE HEARD TWO LOAD BANGS AND TOWER CANCELED OUR TAKEOFF CLEARANCE FROM SEEING SPARKS FROM ENGINE AND HEARING A LOUD BANG FROM THE TOWER. FROM THE COCKPIT THEY HAD NORMAL ENGINE INDICATIONS AND NO FIRE WARNING. WE CLEARED RUNWAY, SHUT DOWN THE RIGHT ENGINE, AND REQUESTED FIRE CREW TO INSPECT THE JET WITH NO VISIBLE DAMAGE TO RIGHT ENGINE. WE RETURNED TO THE GATE SINGLE ENGINE TAXI, AFTER SHUT DOWN MAINTENANCE FOUND METAL PARTICLES IN THE RIGHT ENGINE. BOROSCOPE OF NR 2. ENGINE WAS ACCOMPLISHED TO SHOW DAMAGE OUT OF LIMITS