Philadelphia police are investigating uncovered skeletal remains, the second such discovery in three days, found in a vacant lot by city workers.

On the 400 block of E. Cambria Street in West Kensington, city workers found the human skeletal remains in a disused lot, NBC reported, adding that the gender of the remains was unknown.

This past weekend, another set of skeletal remains, that of a woman, was found in nearby Ridley Creek State Park. 

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Currently, there has been no conclusion regarding how long the West Kensington remains have been there, CBS reported in a related article.

The investigation is ongoing, NBC added.