engine starts without key

Hey guy's I had the car running yesterday without any problems, this morn I went out to warm it up and as I was starting it I heard what sounded like a wire in a fan blade{that didn't happen} But the only way to shut the car off was with the disconnect switch on the battery. Now if I engage the switch the car turns over with out the key.
What gives???? 340 four speed.
Thanks
AL