What do you think happened to the young princes of Edward V that Richard III placed in the Tower of London?

I think they were suffocated or poisoned. Wasn't there something not too long ago about bones found under the steps and a possibility of a DNA test? Or was I dreaming?

There were two bodies found at a bottom of a staircase where one person reported that they had been buried, but so far all evidence does not show them to be the young boys.