A major apartment fire on the east side displaced 30 people Tuesday night. Fire crews responded about 8:20 p.m. to the Spanish Oaks Apartments, but were delayed by about 10 minutes by frozen hydrants. By that time, the fire had burned through a large section of the roof. No injuries were reported. Firefighters said they had a difficult time interviewing residents about the cause of the fire because most of them were Hispanic and spoke little English.