In a briefing in Washington, the Pentagon said the search and rescue operations continued for the eight on board.
“I’m not tracking an official request received here at the department,” Pentagon spokesman Sabrina Singh told reporters.
“Right now, the Ospreys are still operating in Japan,” she added.
The cause of the crash is under investigation.
On Wednesday, Japan’s coast guard said what appeared to be wreckage from the tilt-rotor V-22 Osprey and one person, who was later confirmed to have died, were found about 3km from the shore.
“The occurrence of such an accident causes great anxiety to the people of the region … and we are requesting the US side to conduct flights of Ospreys deployed in Japan after these flights are confirmed to be safe,” Japan defence minister Minoru Kihara said in parliament on Thursday.
The Japan Self-Defense Forces (SDF), which also operates Ospreys, will suspend flights of the transport aircraft until the circumstances of the incident are clarified, another defence ministry official said.
Speaking to reporters later in the evening, Kihara confirmed reports that the US military was still operating its Ospreys, saying that Japan’s regional defence bureau had counted 20 landings and takeoffs of Ospreys around US bases by 3.30pm on Thursday.
A spokesman for US military forces in Japan did not immediately respond to a request for comment.
“Our focus is on the ongoing search and rescue operations, and we’re praying for a safe return,” Rahm Emanuel, the US ambassador to Japan, said in a post on X.
Witnesses said the aircraft’s left engine appeared to be on fire as it approached an airport for an emergency landing in clear weather and light winds, media reported.
Developed by Boeing and Textron-owned Bell Helicopter , the hybrid V-22, which can land and take off like a helicopter and fly like a fixed-wing aircraft, is operated by the US Air Force, Marines and Navy, and Japan’s SDF.
The deployment of the aircraft in Japan has been controversial, with critics of the US military presence in the southwest islands saying it is prone to accidents. The US and Japan say it is safe.
“It’s very regretful and it should not happen at all,” Kihara said to reporters on Thursday evening, when asked for his thoughts on the accident happening in the southwest region of Japan, where the US Marines are largely based.
Japan hosts the biggest overseas concentration of US military power, with the country home to the only forward-deployed American carrier strike group, its Asian airlift hub, fighter squadrons and a US Marine Corps expeditionary force.
In August, a US Osprey crashed off the coast of northern Australia while transporting troops during a routine military exercise, killing three US Marines.
Another crash-landed in the ocean off the southern island of Okinawa in December 2016, the first such incident in Japan, prompting a temporary US military grounding of the aircraft.
The last fatal US military aircraft crash in Japan was 2018, when an in-flight collision during a training exercise killed six people, according to the defence ministry.