WARSAW, Poland (AP) — Poland will seek the arrest and extradition of a Minnesota man exposed by The Associated Press as a former commander in an SS-led unit that burned Polish villages and killed civilians in World War II, prosecutors said Monday.

Prosecutor Robert Janicki said evidence gathered over years of investigation into U.S. citizen Michael K. confirmed “100 percent” that he was a commander of a unit in the SS-led Ukrainian Self Defense Legion.

He did not release the last name, in line with Poland’s privacy laws, but the AP has identified the man as 98-year-old Michael Karkoc, from Minneapolis.

“All the pieces of evidence interwoven together allow us to say the person who lives in the U.S. is Michael K., who commanded the Ukrainian Self Defense Legion which carried out the pacification of Polish villages in the Lublin region,” Janicki said.

The decision in Poland comes four years after the AP published a story establishing that Michael Karkoc commanded the unit, based on wartime documents, testimony from other members of the unit and Karkoc’s own Ukrainian-language memoir.

Read the whole story from Associated Press.