WASHINGTON - The Chinese Embassy in the United States said on Thursday that two Chinese citizens were among the victims in the mid-air collision of a passenger plane and a helicopter near Reagan National Airport Wednesday night.

In a statement obtained by Xinhua, the Chinese Embassy expresses its deep condolences to all the victims and offers heartfelt sympathy to their families.

The embassy has requested the US side to verify the details of the incident and formally inform the Chinese side, and to provide the victims' families assistance in handling the aftermath.

The statement said the embassy will also offer consular protection and assistance within its responsibilities.

The National Transportation Safety Board confirmed that both black boxes, which refer to the flight data recorder and cockpit voice recorder, from the American Airlines plane have now been recovered.

READ MORE: No clear reason yet for Washington air disaster that killed 67, officials say

The mid-air collision involved an American Airlines regional jet that had departed from Wichita, Kansas, with 60 passengers and four crew members on board, and a military Blackhawk helicopter with three US Army soldiers.

US President Donald Trump confirmed there are no survivors in the collision at a press conference in the White House on Thursday.