ShahwarZia

I turned my amp on it was working fine and then I connected my laptop to the CD/mp3 input and my guitar sound turned off.. I checked if the volume was on and it was.. I then tweaked the models knob and I heard a spark and the amp turned off and smoke started coming out of it. I removed all of the cables immediately. can any one tell me which component fried? why did this happen and is it repairable?