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A detention hearing was scheduled for Tuesday in Greenbelt, Maryland. It was not clear if prosecutors would file additional charges accusing him of planning an attack.
Members of the public walk dazed along the promenade in Nice in 2016, in the confusion that followed the truck attack.Credit:AP
The charge of interstate transportation of a stolen vehicle, which carries up to 10 years in prison, is likely a placeholder count, with prosecutors expected to present evidence before a grand jury and secure an indictment with new charges.
A defense lawyer for Henry declined to comment.
The government's six-page detention motion describes Henry as harbouring hatred for "disbelievers" and looking to emulate Islamic State militants he saw on beheading videos and fighting overseas.
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On his phone, which prosecutors say he discarded on a highway, authorities found images of the ISIS flag, armed ISIS fighters and the man who carried out the massacre in an Orlando, Florida, nightclub three years ago.
The document alleges that Henry, a computer engineer, walked off his job in the middle of the day last month and stole a U-Haul van from the parking garage of a mall in Virginia after determining that his four-door sedan "would not cause the catastrophic damage that he desired."
He first considered an attack at Dulles International Airport, trying unsuccessfully to breach the security perimeter and get into a restricted area, prosecutors said.
From there, he headed to National Harbor - a waterfront complex of restaurants, retail and hotels in Maryland.
"But so early in the morning on a weekday," prosecutors wrote, "the defendant did not find the sizeable crowd upon which he desired to inflict his radical conduct."
Henry then broke into a boat, sleeping there overnight, and was arrested on the morning of March 28 when he leaped over the security fence from the boat deck, according to the detention motion.
Associates of Henry expressed surprise at the allegations.
Osman Alaalla, 61, came to pray Monday evening at a 5pm service at the Islamic Society of Germantown. He said Henry typically led that service. Alaalla described Henry as a quiet, nice man but said he didn't know anything about his personal life. He said he would come to pray and leave.
"He's very peaceful," he said.