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.



Reuters reporter Myles Miller:

More from on-scene tweeter Vanessa Sink:

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



Disturbing tweet from a local NBC reporter:

Another on-scene tweet:


The man did not survive his injuries.