LANHAM, Md. (CBSDC) – Two people were killed and three firefighters were injured in a vacant apartment fire in Southeast D.C. on Tuesday morning.

Fire and rescue personnel were called at about 10 a.m. to the 1700 block of R Street for a blaze in the second floor of a vacant four-story apartment building.

Fire officials have not yet been able to identify the two people who died in the fire due to the extent of their burns, WUSA-9 reports. Three D.C. firefighters sustained injuries in the fire, but none are considered serious.

D.C. Deputy Fire Chief Edward Pearson said the building was boarded up and should have been vacant. They are investigating how the people found dead made their way inside the building.

The two-alarm fire forced neighbors to evacuate and caused damage to two adjacent buildings.

View more photos of the fire here.

Follow WNEW on Twitter.