Just got home from work and put my car into park and heard a grinding sound.
The parking brake stopped working. I tried putting it into drive and got the same grinding sound. It was as if something was scraping against the asphalt.
Check your e-brake drum shoes. They are located on the inside of the rear wheels. If the drum is rusted or the shoe (pad) is scraping it would make a scraping noise such as the one you described.