The ICE involvement is interesting. According to the WW, their involvment is not because of illegal immigration. As the
WW article states, "An FBI agent also works part-time on the case, as do two officials from U.S. Immigration and Customs Enforcement. Jones has said that ICEs assistance is not related to any suspected illegal immigrant connection to this case."
But, ICE can also deal with many other areas. The
ICE website states, "ICE investigations cover a broad range of areas, including national security threats, financial and smuggling violations (including illegal arms exports), financial crimes, commercial fraud, human trafficking, narcotics smuggling, child *advertiser censored*/exploitation, and immigration fraud." That covers much ground.
Perhaps ICE's involvment is just to provide their investigative expertise, IDK. "ICE combines innovative investigative techniques, new technological resources and a high level of professionalism to provide a wide range of resources to the public and to our federal, state and local law enforcement partners." As "the largest investigative agency in the U.S. Department of Homeland Security" (quoted from their website), maybe they have the personnel to share.