(PHILADELPHIA) — A man seen scaling the outside of a 19-story apartment building to escape a fire in Philadelphia on Thursday night made it to ground level unharmed.Four residents and three police officers were injured, ABC Philadelphia station WPVI-TV reported.Fire crews are investigating the cause of the blaze, which began around 9:30 p.m. in the 4400 block of Holden Street.The fire may have begun in a trash compactor, according to WPVI.The building was evacuated, but several residents remain unaccounted for.

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