A family of five, including three children as young as 15 months, died in a blaze Saturday that filled an apartment with thick black smoke and kept the victims from escaping through the front door, AP quoted fire officials as saying. A 10-year-old boy who survived was in critical condition after the fire in a public housing complex in Manhattan's Chelsea neighborhood. The boy was found with two other family members in a back bedroom, while the rest of the family sought refuge in a full bathtub and underneath a bathroom sink, officials said. The cause of the fire, which began in the kitchen of the sixth-floor apartment, was under investigation. But the Fire Department said the apartment's smoke detector had been unplugged and the battery removed.