This happened last week, but the video is making the rounds now. Somebody riding on a New York City subway filmed a fire that was inside three shopping carts on the platform. And then something inside them starts exploding like small bombs.
One of the riders calls 911, and you see the fires still burning as the car pulls away. The fire department got it under control, and no one was injured. A spokesperson said the explosions were probably caused by aerosol cans in the carts.