LONDON — Two military helicopters have collided in mid-air killing all 10 crew members aboard the two aircraft as they flew in formation during a rehearsal for a military parade, ABC News has learned.

Video seen by ABC News on social media shows the moment of impact between the two helicopters as parts of both helicopters, including the rotor, flying off.

The 10 crew members on board the helicopters have not yet been identified and the circumstances that led up to the major crash are currently unclear.

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There are no known survivors from the crash.

This is a developing story. Please check back for updates.

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