Massive building fire accidentally started by workers , police report says . Up to 500 residents homeless after 240 units burned in Edgewater , New Jersey , police says . Some 300 other residents temporarily evacuated from nearby buildings .
Massive apartment fire accidentally started by workers , police chief says . Up to 500 residents homeless after 240 units burned in Edgewater , New Jersey , official says . Some 520 other residents temporarily displaced from nearby buildings .