A criminal investigation is underway in the deadly Oakland, California, warehouse fire. The fire started on Friday during a late-night dance party. Flames raced through the building.At least 33 people were killed, and the final toll could be much higher. Officials have released the names of only seven of the confirmed dead, and the victims are as young as 17. The building, known as the “Ghost Ship” containing artist studios, may have been an illegal home for dozens of people. Officials told CBS News that crews have only searched through about 40 percent of the charred warehouse so far.