INDIANAPOLIS — An early morning fire at a Northwest Side apartment complex sent one person to the hospital and prompted the evacuation of about 50 people, according to the Indianapolis Fire Department.

Crews were dispatched to the El Dorado apartment complex off W. 21st and N. Tibbs Avenue shortly after 3:30 a.m.

Firefighters reported seeing strong flames coming from a four-story building with 40 units.

The IFD had to use floor ladders to rescue 12 people from all four sides of the building. A total of 50 people were evacuated.

One person was taken to a local hospital to be examined for smoke inhalation.

“Pretty scary moment for all these people because they were sleeping,” said IFD public information officer Rita Reith.

She says the fire was contained to a single apartment, but the entire building was filled with “high levels” of smoke. These smoke levels are what led to the massive evacuation.

Officials say the fire did not spread to other units because the exteriors of the apartments are concrete.

The cause of the fire remains under investigation.