Blow out the tire like miracle

During I commuted in the dark, my bicycle's rear tire blew out. When I checked it, I found a metal plate inserted into the brake system. Was it possible to happen such trouble naturally ?
The plate turned with the surface of tire for a while. I listened the sound at the time. And it went into brake system.
Long scarring appeared. The length was about 5mm and it was very deep. I used the tire only about 300 km. The prise was about 4,000 yen. It was hard damage for my wallet, too.