Returning to my car after class this morning, I find the hood of my Impala, popped, as though the hood lever was pulled. I proceed to unlock with the fob, the horn chirps twice. I then turn the ignition, and get a message on the dash computer "Theft Attempted". There were no visible signs of damage as if someone tried to pry the hood open. As of yesterday, I changed my oil, and I keep thinking, maybe I did not close the hood hard enough, yet why did I get a theft message. Help would be appreciated, maybe someones after my LTZ.