Federal criminal investigators confirmed this week they are looking into John Simpson, founder of an organization that partnered with the mother of one of the military servicemen killed on July 16.

Members of the Lance Corporal Skip Wells Foundation publicly accused Simpson two weeks ago of misappropriating funds. They said Simpson befriended Wells’ mother, Cathy Wells. She and Simpson held joint fundraising events, splitting the money between her foundation and his own, Marines and Mickey.

The leaders of the Wells foundation don’t believe Simpson used most of the the money for Marines and Mickey. They also accuse him of lying about his military record.

“I can confirm that [the Naval Criminal Investigative Service] is responding to complaints regarding financial practices of the charity ‘Marines and Mickey,'” NCIS Public Affairs Officer Ed Buice said in a statement. “If other individuals have similar concerns, NCIS would like to speak with them. Beyond that, NCIS does not discuss the details of ongoing investigations.”