crazyemi

I have an 06 V6 with the automatic transmission, and today when I pulled into the parking lot at a restaurant, I heard a very loud pop and then it sounded as if the right front brake was grinding hard, like metal scraping the ground. The sound it was making was like nails on a chalkboard, but 20 times worse. I got the car parked, and brought my dad out to look at it, and it seems that whenever I try to move the car by putting it in neutral or by applying the brake when it's moving, it makes the noise. There's nothing under the ground or any fluid under the car, but it got worse from there. By the time that the tow truck came to take it back to the dealership (the car is still under warranty), I tried to move the shift lever, and when I applied the brake, the pedal stayed depressed even when my foot wasn't on it, and the shift lever wouldn't move. We turned the car off and then on again and it moved, but it still made the grinding noise when put in neutral.

Does anyone have any idea of what could be wrong with my car? Everything's totally stock, and maintenance has been performed regularly. This car hasn't had too many problems, but now it won't even move (and yes, I have checked, and the parking brake is off as well.)