A man traveling from Nigeria was arrested after US airport officials say they found him carrying $78,883 (euro61,665) in cash and a laptop computer containing information about nuclear materials and cyanide.
He will be held in custody at least until Monday, a US magistrate ruled Wednesday.
Assistant US Attorney Leonid Feller said Sisayehiticha Dinssa, an unemployed US citizen, is a potential risk to the community and federal agents want to get a warrant to search his computer more thoroughly, The Detroit News reported.
US Magistrate Donald Scheer approved Feller's request to detain Dinssa. He is charged with concealing more than $10,000 (euro7,800) in his luggage, which carries a maximum penalty of five years in prison, plus forfeiture of the money, the Detroit Free Press reported.
Feller said Dinssa, of Dallas, arrived in Detroit from Nigeria by way of Amsterdam and was headed for Phoenix.