SOMERVILLE, NJ - Investigators from local, county and state agencies were on site Saturday combing through the ruins of the 200 Parcview Apartments looking for the cause of Friday's multi-alarm fire at the four-story structure.

As investigators worked inside the shell of the building, firefighters ran pumps to empty out the basement  which was filled with water from Friday's effort to douse the flames. The building was nearing completion and was unoccupied at the time of the fire, although workmen were inside when the fire was first reported around 9:30 a.m. Friday.

The Somerset County Prosecutor's office will lead the investigation, according to Prosecutor Michael H. Robertson. On site Saturday in addition to the prosecutor's arson task force were New Jersey state arson investigators, the Somerville Fire Marshal and fire marshals from several other surrounding towns.

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On Friday, emergency units from throughout Somerset County assisted Somerville firefighters, with aerial ladder trucks hosing down the structure for more than two hours.

No one was injured in the fire.

Residents were evacuated Friday from 100 Parcview Apartments, a companion building only recently occupied by tenants.

The Parcview complex backs up to the NJTRANSIT Raritan Valley railroad tracks.