What was found
(CAN) CLIMBING THROUGH APPROX 17,000' AT 320 KIAS, WITHOUT WARNING, A BANG WHICH CAUSED ACFT TO SHUDDER FOLLOWED BY VIBRATION & A HOWLING NOISE NR 2 ENG VIBRATION INDICATOR READING IN EXCESS OF 2 UNITS, EGT & OIL TEMP STARTED TO RISE, & ALSO A DROP IN EPR. ACFT LEVELED OFF & THRUST REDUCED ON BOTH ENGINES. CARRIED OUT ENG SEVERE DAMAGE QRC. ADVISED ATC OF PROBLEM WITH AN ENG & THAT IT HAD BEEN SHUTDOWN & REQUESTED CLEARANCE BACK TO BASE. ASKED EMPLOYEE ABOARD TO LOOK OUT WINDOW AT ENGINE. THE QRC REFERENCE ITEMS CARRIED OUT. DECLARED AN EMERGENCY. NR 1 ENGINE INOPERATIVE LANDING CHECKLIST CARRIED OUT.