The war crimes case of Special Operations Chief Edward Gallagher just got more complicated as the Navy is expanding its investigation to SEAL Team 6 operators.

According to warrant documents and emails leaked to the Navy Times, the Naval Criminal Investigative Service (NCIS) is trying to determine if Chief Gallagher colluded with SEALs from the Naval Special Warfare Development Group (DEVGRU), another title forSEAL Team 6. According to the documents and electronic messages, Chief Gallagher allegedly encouraged DEVGRU operators to obstruct justice by coercing SEALs familiar with Chief Gallagher’s actions to remain silent. Furthermore, Chief Gallagher appears to have asked them to retaliate against anyone who spoke to the NCIS agents.

Since the whole affair began last fall, NCIS agents have been tracking electronic devices across the SEAL community to determine the veracity of the war crimes accusations. A number of SEAL Team 7 operators have been granted transactional immunity, which protects a witness from prosecution for the offense or offenses involved in a case, in exchange for testifying against Chief Gallagher.

Since the very early stages of the Global War on Terror, DEVGRU operators have been involved in war crimes cases. From subjecting the heads of dead enemies to “canoeing” (splitting the skull by shooting a round at the upper forehead), to chopping heads with hatchets, to intentionally calling airstrikes on buildings packed with civilians in Iraq or Afghanistan, there has been much controversy around the Tier 1 Navy unit.