West Reading Mayor Samantha Kaag said in a statement on Sunday that none of the victims would be named until officials are certain all families had been contacted.
"Please understand that this is a devastating loss, but we are truly grateful to bring closure to the families involved in the upcoming days," Kaag said.
Earlier Kaag confirmed to the Associated Press that the fifth body was found on Sunday morning by first responders and confirmed dead by the Berks County Coroner's Office. The coroner was unable to confirm the identity of that person, Kaag said.
West Reading Borough Chief of Police Wayne Holben confirmed the body of a fourth victim was found under debris early Sunday at the R.M. Palmer Co. plant in the borough of West Reading, about 95 kilometres northwest of Philadelphia.
Holben asked for continued prayers from the community and vowed that rescuers and officials "will not rest until every single person affected by this tragedy has been accounted for" from the blast that occurred just before 5pm on Friday.
Rescue crews had been using heat imaging equipment and dogs to search for possible survivors after the blast destroyed one building and damaged a neighbouring building. Crews were using heavy equipment to methodically and carefully pull debris from the site, Holben said.
Three buildings around the site will be condemned as a precaution.
Officials said they had no update on the condition of a woman pulled alive from the rubble ob Saturday. Kaag said she had apparently been on the second floor and was found in a "hopeful circumstance," calling out to rescuers despite her injuries after a dog located her.
Officials also reported no updates on the conditions of those taken to hospital. Reading Hospital said it received 10 patients and transferred two to other facilities, while two others were admitted in good and fair condition respectively and the others had been discharged.
State and local fire investigators are determining the cause of the blast.
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