OTTAWA, Ill. (CBS/AP) — LaSalle County authorities have identified three men killed last week in an explosion near Starved Rock State Park.

The coroner’s office identified the men killed as 39-year-old Immer Rivera Tejada; 26-year-old Guillermo Rivera Tejada and 36-year-old Rafael Rivera Tejada, all of Chicago.

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Coroner Rich Ploch previously said the men were “cousins and uncles.”

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Authorities said the men were killed Thursday when they ignited a black powder substance that exploded along a bank of the Illinois River 75 miles southwest of Chicago.

Illinois State Police say their investigation into the incident continues.

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