Reports of a helicopter landing on the National Mall this afternoon:

Oh no:

Very scary if true. This tweeter says she saw it happen:

More photos:

We will continue to monitor this situation and update with developments.

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Update:

Reuters reporter Myles Miller:

More from on-scene tweeter Vanessa Sink:

NBC Nightly News reports that the man was found conscious and breathing:

***

Update:

Disturbing tweet from a local NBC reporter:

Another on-scene tweet:

Update:

The man did not survive his injuries.

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