In Buddhist teaching, the law of karma, says only this: `for every event that occurs, there will follow another event whose existence was caused by the first, and this second event will be pleasant or unpleasant according as its cause was skillful or unskillful.' A skillful event is one that is not accompanied by craving, resistance or delusions; an unskillful event is one that is accompanied by any one of those things.
Therefore, the law of Karma teaches that the responsibility for your actions is born by the person who commits them. In other words, choose your actions wisely because they usually return to you in some way :).