The explosion late Wednesday night sent debris hundreds of feet, and people more than a mile away reported the blast was strong enough to shake their homes.
Two bodies were recovered Thursday and another one was found Friday. The victims have been transported to the office of the chief medical examiner in Baltimore and haven't been identified.
Eight people remain unaccounted for, including two children, the Montgomery County Police Department said. Police say they believe the first four bodies that have been found among the eight unaccounted-for people.
Officials urged the public to be patient as the heat and concerns about the structure collapsing have slowed their efforts.
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"We would like to do this more quickly. We just simply can't. It's too dangerous," Dave Steckel, the county's acting fire chief, told reporters Sunday. "We have to be very careful and methodical with what we do so we don't make this tragedy worse than it already is," he said.
Authorities identified the people who are missing as: Saeda Ibrahim, Augusto Jimenez Sr, Maria Auxiliadorai Castellon-Martinez, Aseged Mekonen, Deibi "David" Samir Lainez Morales, Oscar Armando Ochoa, Fernando Josue Hernandez Orellana, Saul Paniagua.
The Montgomery County Police Department said those people are believed to be in one of the apartment buildings at the time of the explosion. The department said detectives haven't been able to confirm that Ochoa was in the building at the time of the fire.