A day after New York City's deadliest fire in more than 25 years, family members were grappling with shock and grief upon learning an unsupervised toddler started the blaze. A 3-year-old boy's screams alerted his mother that a fire had erupted in their first-floor apartment Thursday night. The boy had been playing with the burners on the kitchen stove -- something he was known to have done before, New York fire officials said.