ROCKFORD, Ill. (WTVO) — Authorities have identified the man whose body was found in the Rock River earlier this week as a resident of Altoona, Wisconsin. The identification of the deceased has led to ongoing police activity at a house in Altoona on Friday.

On Tuesday, Rockford Police said an 80-year-old man’s body was found in the water, on the rocks near the Fordham Dam in downtown Rockford, near the Embassy Suites Hotel.

Officials said the death was deemed suspicious due to the nature of the injuries.

Once the man was identified as a resident of Altoona, police there were notified, leading the investigation to a home on St. Andrews Drive.

Authorities said investigators from the Altoona and Rockford Police departments, along with the Wisconsin Division of Criminal Investigation executed a search warrant at the location at 7:30 p.m. Thursday and were still on scene throughout Friday.

Altoona Chief of Police Kelly Bakken said a “significant amount of evidence was collected” at the residence, and a van had been towed as part of the investigation.

She also said several “persons of interest” were in custody, but, when pressed, did not say if they were in custody in Rockford or Altoona, saying there were “multiple jurisdictions involved.”

Police did say the crime appears to be an isolated incident, based on the evidence collected.

Bakken also said that no missing persons report had been filed for the missing man.

No identifications have been released yet by any law enforcement agency.