A Durham man was charged by federal authorities with supporting ISIS and later attempting to join the group, according to court documents that were unsealed on Tuesday.

Investigators learned that his flight was set for Dec. 4 from RDU with a return flight to the Triangle on Dec. 18. An FBI special agent noted that White likely purchased a round-trip ticket to avoid arousing suspicion, a common practice among Islamic extremists.

Alexander Justin White, a Durham resident, was arrested for allegedly supporting IS. The FBI uncovered his plans to join the group abroad after months of undercover communication and online investigations.