U.S. and Japanese dive teams have found the remains of five more crew members from a CV-22 Osprey tilt-rotor aircraft that crashed off southwestern Japan last week, with recovery efforts ongoing Tuesday.

The Pentagon said a day earlier that two of the five crew members’ remains that had been located were recovered from the wreckage of the aircraft.

The Osprey went down in waters off Yakushima Island in Kagoshima Prefecture last Wednesday, and prior to Monday’s announcement, one body had been recovered. Two other crew members remain unaccounted for.

"There is an ongoing combined effort to recover the remaining crew members from the wreckage," Pentagon spokesperson Sabrina Singh said in Washington. “As efforts persist for the location and recovery of the entire crew, the privacy of the families and loved ones impacted by this tragic incident remains a great concern.”

Singh said the identities of the service members who were found “have yet to be determined and will be released at a later date.” Prior to the discovery of the five bodies, the only fatality identified had been Staff Sgt. Jacob Galliher, a 24-year-old direct support operator assigned to the 43rd Intelligence Squadron, the U.S. Air Force Special Operations Command said.

The crash — the first fatal incident in Japan involving an Osprey, which some say is prone to accidents — has reignited concerns in the country over the aircraft.

Japan had asked the U.S. side to halt operations of all Ospreys in the country, according to the Defense Ministry. The U.S. military, however, has said that while the unit that the crashed CV-22 Osprey belonged to has suspended flights, other versions of the aircraft were continuing to fly after undergoing safety checks.

"Concerns have not yet been allayed, so we need to continue to receive information" on the crash from the U.S. side, Defense Minister Minoru Kihara said Tuesday.

Asked about this, Singh called the U.S. response “standard” and said it was “taking all appropriate measures, as we do for every flight and every operation.”

Some wreckage from the CV-22 aircraft was collected by local fishermen and the Japan Coast Guard and handed over to the U.S. military, but the cause of the crash remains unclear.

The aircraft was one of six U.S. Air Force CV-22s assigned to Yokota Air Base in the western suburbs of Tokyo headed for the Kadena Air Base in Okinawa Prefecture from another U.S. base in Iwakuni, Yamaguchi Prefecture, when it went down.

It is highly likely that a fire broke out in an engine of the CV-22 while it was flying in helicopter mode with the rotor facing up, media reports have said, with flames seen in its left engine, and information that the aircraft was spinning before it crashed.

Ospreys have an engine structure integrated with a rotor at the end of the left and right main wings, and the rotor angle can be adjusted. When the rotors are directed upward, vertical takeoffs and landings are possible. High-speed flights, meanwhile, are possible when the rotors are tilted forward.

Yakushima is part of the Nansei Island chain, where both the U.S. and Japan have looked to bolster their presence amid growing military assertiveness by China. However, the accident has highlighted anxiety among the public about the increasing deployment of Ospreys in the area and across Japan.

While the Osprey has a history of accidents, including a 2016 crash off Nago, Okinawa Prefecture, last week's crash is the deadliest since the aircraft officially entered into operational service in 2007 — though an April 2000 crash in Arizona during testing killed all 19 U.S. Marines on board.