Mystery gas odor in New York

Authorities were investigating the source of a mysterious gas-like odor today that stretched across a large part of Manhattan, including Rockefeller Center. "We are confident it is not dangerous," New York Mayor Michael Bloomberg said at a news conference. Bloomberg said the city's air sensors had not detected an elevated level of natural gas.

developing..

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WNBC


Update #1:Dead birds in Austin Texas
10 blocks of downtown Austin shut down.
CNN - Austin, Texas story


Update #2:ABC 7 updates
could be a mercaptan leak (this is added to natural gas which is normally odorless)

Update #3:Rolling updates and photos from Gothamist